Professor Hugh Blackburn

Professor Hugh Blackburn

Professor
Department of Mechanical and Aerospace Engineering
Room 209, 20 Research Way (Building 82), Clayton Campus

Hugh works in the Faculty of Engineering at Monash University as a Professor.

Prof Hugh Blackburn (Mechanical and Aerospace Engineering, Monash University) holds a BE from UniSA (1982) and a PhD from Monash (1993), in the area of bluff body fluid mechanics. Prior to commencing his PhD at Monash in 1985 he worked as a consulting engineer for Kinhill Engineers. At Monash he concurrently worked as a junior academic until the end of 1993. He joined CSIRO in 1994 where he carried out both fundamental and applied research in fluid dynamics. In 2007 he re-joined Monash University. His principal research area is the physics of unsteady flows and associated computational methods. He is a Fellow of the Institution of Engineers Australia and of the Australasian Fluid Mechanics Society.

Research Projects

Current projects

Flow Measurement Facility for Large-Scale Industrial Aerodynamics

Using advanced laser-based particle imaging velocimetry the flow measurement system for large-scale industrial aerodynamics will provide researchers with a powerful tool for resolving high speed and large scale industrial flows. The primary objective of the system, housed at Australia’s largest aerodynamic facility, will be the characterisation of complex, three dimensional turbulent flows, which are not yet well understood. The project aims to advance the state of knowledge of the unsteady aerodynamic wakes of cars, trucks, athletes, turbines and micro-air vehicles. If successful the research will reduce aerodynamic drag in transport and improve wind power generation, ultimately improving efficiency and reducing emissions.

Application of exact coherent structures to transition and turbulence

Recognition in the 1980s that apparently well-organised or coherent motions appear persistently in turbulent flows provided an insight which opened the possibility for understanding and control of such flows, but lacked a sound basis in theory. Recent work suggests that coherent structures in turbulence may be identified with nonlinear solutions of the exact equations of motion. Such “exact” coherent structures have their Reynolds number dependence described explicitly and apply for moderate to very large Reynolds numbers, well above the range of full Navier-Stokes calculations. The project aims are to deepen understanding of these structures and to devise methods to prevent bypass transition to turbulence and reduce turbulent wall drag.

Dynamics of fire whirls and dust devils

Fire whirls and dust devils are strongly swirling localised vortex flows that result from an interplay of circulation
and buoyancy, may extend hundreds of metres into the air, and have some obvious similarities as well as a few
differences. We will unify treatments and gain a fundamental understanding of the sets of local conditions that
produce and stabilise these flows. We will achieve this understanding using computational fluid dynamics
matched to laboratory experiments and dimensional analysis of results. In wildfires, fire whirls serve to initiate
spot fires ahead of the fire front by projecting firebrands away from the ground strike, and we will also model these mechanics and transport for use in fire propagation models.

Past projects

Strengthening merit-based access and support at the new NCI petascale supercomputing facility

Access to world-class high-performance computing resources is a necessity for many areas of nationally significant research. It enables researchers to establish and maintain international competitiveness by establishing capacity, driving innovation and underpinning fundamental knowledge discovery. This application, from six research-intensive universities, will establish dedicated resources for 2012 to 2015 on Australia’s leading high-end research computing services based at the National Computational Infrastructure national Facility. It will also leverage $50M in infrastructure support from the Commonwealtha and $32M in co-investment from CSIRO, the Bureau of meterology and ANU.

Catastrophic transition to turbulence in rotation-dominated flows

Catastrophic transition to turbulence in fast-rotating flows has been known of for many decades but no convincing explanation has emerged. This project will conduct numerical and experimental investigations specifically designed to find the underlying mechanism. In turn this will enable the prediction of sudden transition to turbulence in flows dominated by rotation: many geophysical flows such as tropical cyclones, the Earth’s molten core; swirling combustion chamber flows etc. Since also the mechanisms are expected to be relevant to mesoscale motions in turbulent rotating flows, the understanding developed will also be relevant to turbulence models for these flows, whose performance is currently poor.

Designing textured roughness to control turbulent pipe flow

A recent theory proposed by PIs McKeon and Sharma advances the idea that turbulent pipe flows can be understood in terms of the linear response of Fourier modes driven by nonlinear forcing; the mean velocity profile must be known in advance in order to close the model. Characteristics of the response modes produced by the model match remarkably well to many features observed in turbulent pipe flows – particularly ‘very large scale’ motions. CIs Blackburn and Rudman will bring expertise in simulation of turbulent pipe flows to bear on the problem and with the PIs set about applying the linear model to the task of passive/open loop control of turbulent pipe flow. The team will also extend the model to deal with shear thinning fluids.

High-resolution molecular tagging velocimetry and thermometry facility

Turbulent flows are of pervasive scientific and engineering importance. Most often, they also involve temperature variations. The proposed Molecular Tagging Velocimetry and Thermometry (MTV&T) facility will provide simultaneous measurements of instantaneous temperature and velocity at high resolution over a planar domain. MTV&T is nonintrusive, as it relies on the emission of long-lifetime phosphors that have been mixed into the working fluid. For this reason, MTV&T is especially well-suited for microscale, non-Newtonian, particle laden flows, and liquid/gas interface flows. The proposed infrastructure will be the first of its kind in
Australia, and will produce data that uniquely advance the engineering and science of complex flows.

Mechanics of Vortex-Induced Vibration of Cylindrical Structures

Computing transient inflow receptivity with application to high-lift airfoils

The objective of this research is to translate concepts from the field of flow control to develop novel approaches to the computation of optimal inflow perturbations in engineering flows. The application focus is on highly loaded airfoils in uses such as wind turbines in strong winds, and axial-flow gas turbine low-pressure-stage blading. Better understanding of the effect of inflow perturbations in promoting (or degrading) high lift and low drag in these applications will lead on to more advanced methods for airfoil design, as extensions of the proposed methodology. Ultimately these methods will increase the effectiveness and efficiency of two central aerodynamic energy-conversion techologies: wind and gas turbines.

Understanding and modifying vortex structures in wind turbine wakes

The primary goal of this research is to understand the structure of a wind turbine’s wake. We seek to determine how the vortices arising from the turbine’s blade tips and the rotor’s hub interact. This interaction will be examined in the near wake close to the turbine and also further downstream, where it develops into small-scale turbulence. Using the outcomes of this research, we will investigate ways to modify the wake structure to improve the wind turbine’s performance. The results will also be used to examine how to arrange turbines in a wind farm, where some turbines are placed downstream of others. Finally, we plan to use these results to develop improved methods for predicting the power produced by a single turbine and wind farms.

ICOMASEF - Instability and Control of Massively Separated Flows

Investigation into flow over complex topography and escarpments for wind turbine siting using experimental and computational methods

Micro-siting of turbines affects both power production and fatigue of turbines, especially when a turbine is sited in a region of high turbulence. Areas of complex terrain and regions near escarpments are attractive potential sites as they offer some of the highest wind resource available. However, characterising the flow regime in these complex areas is a challenging problem as the flow is often separated and highly turbulent. Existing industry standard site assessment software is unable resolve these complex flows. This project will use empirical wind tunnel techniques and a spectral element numerical method to further the understanding of flow over complex topology and escarpments.

Journals articles

Singh J, Rudman M, Blackburn HM (2017)
The influence of shear-dependent rheology on turbulent pipe flow J Fluid Mech 822: 848–879. PDF

Mao X, Zaki T, Sherwin SJ & Blackburn HM (2017)
Transition induced by linear and nonlinear perturbation growth in flow past a compressor blade J Fluid Mech 820: 604–632. PDF

Gómez F & Blackburn HM (2017)
Data-driven approach to design of passive flow control strategies Phys Rev Fluids 2(2): 021901(R)-1–8. PDF

Albrecht T, Blackburn HM, Meunier P, Manasseh R & Lopez JM (2016)
Experimental and numerical investigation of a strongly-forced precessing cylinder flow Int J Heat Fluid Flow 61: 68–74. PDF

Gómez F, Sharma AS & Blackburn HM (2016)
Estimation of unsteady aerodynamic forces using pointwise velocity data J Fluid Mech 804: R4-1–12. PDF

Gómez F, Blackburn HM, Rudman M, Sharma AS & McKeon BJ (2016)
A reduced-order model of three-dimensional unsteady flow in a cavity based on the resolvent operator J Fluid Mech 798: R2-1–14. PDF

Gómez F, Blackburn HM, Rudman M, Sharma AS & McKeon BJ (2016)
Streamwise-varying steady transpiration control in turbulent pipe flow J Fluid Mech 796: 588–616. PDF

Singh J, Rudman M, Blackburn HM, Chryss A, Pullum L & Graham LJW (2016)
The importance of rheology characterization in predicting turbulent pipe flow of generalized Newtonian fluids J Non-Newt Fluid Mech 232: 11–21. PDF

Rowcroft J, Burton D, Blackburn HM & Sheridan J (2016)
Siting wind turbines near cliffs — the effect of wind direction Wind Energy 19: 1469–84. PDF

Chin C, Ng HCH, Blackburn HM, Monty J & Ooi ASH (2015)
Turbulent pipe flow at Reτ=1000: a comparison of wall-resolved large-eddy simulation, direct numerical simulation and hot-wire experiment Comput Fluids 122: 26–33. PDF

Mao X, Blackburn HM & Sherwin SJ (2015)
Optimal suppression of flow perturbations using boundary control Comput Fluids 121: 133–144. PDF

Saha S, Klewicki JC, Ooi ASH & Blackburn HM (2015)
On scaling pipe flows with sinusoidal transversely corrugated walls: analysis of data from the laminar to the low-Reynolds-number turbulent regime J Fluid Mech 779: 245–274. PDF

Albrecht T, Blackburn HM, Lopez JM, Manasseh R & Meunier P (2015)
Triadic resonances in precessing rapidly rotating cylinder flows J Fluid Mech 778: R1-1–11. PDF

Mao X, Blackburn HM & Sherwin SJ (2015)
Nonlinear optimal suppression of vortex shedding from a circular cylinder J Fluid Mech 775: 241–265. PDF

Nemes A, Lo Jacono D, Blackburn HM & Sheridan J (2015)
Mutual inductance of two helical vortices J Fluid Mech 774: 298–310. PDF

Gómez F, Perez JM, Blackburn HM & Theofilis V (2015)
On the use of matrix-free shift-invert strategies for global flow instability analysis Aerosp Sci Tech 44: 69–76. PDF

Rocco G, Zaki T, Mao X, Blackburn HM & Sherwin SJ (2015)
Floquet and transient growth stability analysis of flow through a compressor passage Aerosp Sci Tech 44: 116–124. PDF

Saha S, Klewicki JC, Ooi ASH & Blackburn HM (2015)
Comparison of thermal scaling properties between turbulent pipe and channel flows via DNS Int J Therm Sci 89: 45–57. PDF

Gómez F, Blackburn HM, Rudman M, McKeon BJ, Luhar M, Moarref R & Sharma AS (2014)
On the origin of frequency sparsity in direct numerical simulations of turbulent pipe flow Phys Fluids 26: 101703-1–7. PDF

Mao X & Blackburn HM (2014)
The structure of primary instability modes in the steady wake and separation bubble of a square cylinder Phys Fluids 26: 074103-1–10. PDF

Saha S, Klewicki JC, Ooi ASH, Blackburn HM & Wei T (2014)
Scaling properties for the equation for passive scalar transport in wall-bounded turbulent flows Int J Heat Mass Trans 70: 779–792. PDF

Sherry M, Nemes A, Lo Jacono D, Blackburn HM & Sheridan J (2013)
The interaction of helical tip and root vortices in a wind turbine wake Phys Fluids 25: 117102-1–16. PDF

Blackburn HM, Hall P & Sherwin SJ (2013)
Lower branch equilibria in Couette flow: the emergence of canonical states for arbitrary shear flows J Fluid Mech 726: R2-1–12. PDF

Mao X, Blackburn HM & Sherwin SJ (2013)
Calculation of global optimal initial and boundary perturbations for the linearised incompressible Navier–Stokes equations J Comput Phys 235: 258–273. PDF

Mao X, Blackburn HM & Sherwin SJ (2012)
Optimal inflow boundary condition perturbations in steady stenotic flow J Fluid Mech 705: 306–321. PDF

Mao X, Sherwin SJ & Blackburn HM (2012)
Non-normal dynamics of time-evolving co-rotating vortex pairs J Fluid Mech 701: 430–459. PDF

Klewicki J, Chin C, Blackburn HM, Ooi A & Marusic I (2012)
Emergence of the four layer dynamical regime in turbulent pipe flow Phys Fluids 24: 045107-1–14. PDF

Koal K, Stiller J & Blackburn HM (2012)
Adapting the spectral vanishing viscosity method for large-eddy simulations in cylindrical configurations J Comput Phys 231: 3389–3405. PDF

Loh SA & Blackburn HM (2011)
Stability of steady flow through an axially corrugated pipe Phys Fluids 23(11): 111703-1–4. PDF

Saha S, Chin C, Blackburn HM & Ooi ASH (2011)
The influence of pipe length on thermal statistics computed from DNS of turbulent heat transfer Int J Heat Fluid Flow 32:1083–1097. PDF

Mao X, Sherwin SJ & Blackburn HM (2011)
Transient growth and bypass transition in stenotic flow with a physiological waveform Theoret Comput Fluid Dyn 25(1): 31–42. PDF

Blackburn HM & Lopez JM (2011)
Modulated waves in a periodically driven annular cavity J Fluid Mech 667: 336–357. PDF

Chin C, Ooi ASH, Marusic I & Blackburn HM (2010)
The influence of pipe length on turbulence statistics computed from direct numerical simulation data Phys Fluids 22: 115107-1–10. PDF

Blackburn HM & Sheard GJ (2010)
On quasi-periodic and subharmonic Floquet wake instabilities Phys Fluids 22: 031701-1–4. PDF

Cantwell CD, Barkley D & Blackburn HM (2010)
Transient growth analysis of flow through a sudden expansion in a circular pipe Phys Fluids 22: 034101-1–15. PDF

Barkley D, Blackburn HM & Sherwin SJ (2008)
Direct optimal growth analysis for timesteppers Int J Num Methods Fluids 57: 1435–1458. PDF

Blackburn HM, Sherwin SJ & Barkley D (2008)
Convective instability and transient growth in steady and pulsatile stenotic flows J Fluid Mech 607: 267–277. PDF

Blackburn HM, Barkley D & Sherwin SJ (2008)
Convective instability and transient growth in flow over a backward-facing step J Fluid Mech 603: 271–304. PDF

Lester DR, Rudman M, Metcalfe GP & Blackburn HM (2008)
Global parametric solutions of scalar transport J Comp Phys 227: 3032–3057. PDF

Blackburn HM & Sherwin SJ (2007)
Instability modes and transition of pulsatile stenotic flow: pulse-period dependence J Fluid Mech 573: 57–88. PDF

Prakash M, Cleary PW, Ha J, Noui-Mehedi MN, Blackburn HM & Brooks G (2007)
Simulation of suspension of solids in a liquid in a mixing tank using SPH and comparison with physical modelling experiments Prog Comp Fluid Dyn 7(2/3/4): 91–100. PDF

Rudman M & Blackburn HM (2006)
Direct numerical simulation of turbulent non-Newtonian flow using a spectral element method Appl Math Mod 30(11): 1229–1248. PDF

Elston JR, Blackburn HM & Sheridan J (2006)
The primary and secondary instabilities of flow generated by an oscillating circular cylinder J Fluid Mech 550: 359–389. PDF

Sherwin SJ & Blackburn HM (2005)
Three-dimensional instabilities and transition of steady and pulsatile axisymmetric stenotic flows J Fluid Mech 533: 297–327. PDF

Leung JJF, Hirsa AH, Blackburn HM, Lopez JM & Marques F (2005)
Three-dimensional modes in a periodically driven elongated cavity Phys Rev E 71: 026305-1–7. PDF

Blackburn HM, Marques F & Lopez JM (2005)
Symmetry breaking of two-dimensional time-periodic wakes J Fluid Mech 522: 395–411. PDF

Blackburn HM & Sherwin SJ (2004)
Formulation of a Galerkin spectral element–Fourier method for three-dimensional incompressible flows in cylindrical geometries J Comp Phys 197(2): 759–778. PDF

Rudman M, Blackburn HM, Graham LJW & Pullum L (2004)
Turbulent pipe flow of non-Newtonian fluids J Non-Newt Fluid Mech 118(1): 33–48. PDF

Marques F, Lopez JM & Blackburn HM (2004)
Bifurcations in systems with Z2 spatio-temporal and O(2) spatial symmetry Physica D 189(3/4): 247–276. PDF

Elston JR, Sheridan J & Blackburn HM (2004)
Two-dimensional Floquet stability analysis of the flow produced by an oscillating circular cylinder in quiescent fluid Euro J Mech/B-Fluids 23: 99–106. PDF

Blackburn HM & Lopez JM (2003)
The onset of three-dimensional standing and modulated travelling waves in a periodically driven cavity flow J Fluid Mech 497: 289–317. PDF

Blackburn HM & Lopez JM (2003)
On three-dimensional quasi-periodic Floquet instabilities of two-dimensional bluff body wakes Phys Fluids 15(8): L57–60. PDF

Blackburn HM & Schmidt S (2003)
Spectral element filtering techniques for large eddy simulation with dynamic estimation J Comp Phys 186(2): 610–629. PDF

Blackburn HM (2002)
Mass and momentum transport from a sphere in steady and oscillatory flows Phys Fluids 14(11): 3997–4001. PDF

Blackburn HM (2002)
Three-dimensional instability and state selection in an oscillatory axisymmetric swirling flow Phys Fluids 14(11): 3983–3996. PDF

Blackburn HM & Lopez JM (2002)
Modulated rotating waves in an enclosed swirling flow J Fluid Mech 465: 33–58. PDF

Blackburn HM, Govardhan R & Williamson CHK (2001)
A complementary numerical and physical investigation of vortex-induced vibration J Fluids & Structures 15(3/4): 481–488. PDF

Blackburn HM (2001)
Sidewall boundary layer instabilities in an enclosed swirling flow J Turbulence 2 009. PDF

Blackburn HM (2001)
Dispersion and diffusion in coated tubes of arbitrary cross-section Computers & Chemical Engineering 25(2/3): 313–322. PDF

Blackburn HM & Lopez JM (2000)
Symmetry breaking of the flow in a cylinder driven by a rotating endwall Phys Fluids 12(11): 2698–2701. PDF

Blackburn HM (2000)
Domain decomposition with Robin boundary conditions across a phase interface ANZIAM J 42(E): C263–C290. PDF

McIver DM, Blackburn HM & Nathan GJ (2000)
Spectral element–Fourier methods applied to turbulent pipe flow ANZIAM J 42(E): C954–C977. PDF

Blackburn HM, Elston JR, Niclasen DA, Rudman M & Wu J (2000)
A hybrid method for simulation of flows in stirred tanks Appl Math Mod 24: 795–805. PDF

Blackburn HM & Graham LJW (2000)
Vortex breakdown — theory and experiment Album of Visualization 17: 13–14.

Blackburn HM & Henderson RD (1999)
A study of two-dimensional flow past an oscillating cylinder J Fluid Mech 385: 255–286. PDF

Blackburn HM, Elston JR & Sheridan J (1999)
Bluff body propulsion produced by combined rotary and translational oscillation Phys Fluids 11(1): 4–6. PDF

Blackburn HM & Melbourne WH (1997)
Sectional lift forces for an oscillating cylinder in smooth and turbulent flows J Fluids & Structures 11(4): 413–431. PDF

Blackburn HM & Henderson RD (1996)
Lock-in behaviour in simulated vortex-induced vibration Exptl Thermal & Fluid Sci 12(2): 184–189. PDF

Blackburn HM, Mansour NN & Cantwell BJ (1996)
Topology of fine-scale motions in turbulent channel flow J Fluid Mech 310: 269–292. PDF

Blackburn HM & Melbourne WH (1996)
The effect of free-stream turbulence on sectional lift forces on a circular cylinder J Fluid Mech 306: 267–292. PDF

Blackburn HM (1994)
Effect of blockage on spanwise correlation in a circular cylinder wake Expts Fluids 18(1/2):134–136. PDF

Blackburn HM & Melbourne WH (1993)
Cross flow response prediction of slender circular-cylindrical structures: prediction models and recent experimental results J Wind Engng & Ind Aero 49: 167–176.PDF

Blackburn HM & Melbourne WH (1992)
Lift on an oscillating cylinder in smooth and turbulent flow J Wind Engng & Ind Aero 41: 79–90.PDF

Attwood R & Blackburn HM (1986)
Predicted moisture loss from soft brown coal during transport by overland conveyor Mech Engng Trans, IEAust 1 March, 12–15.

Conference papers

Singh J, Rudman M & Blackburn HM (2016)
The rheology dependent region in turbulent pipe flow of a generalised Newtonian fluid 20AFMC Perth, December. PDF

Albrecht T, Meunier P Manasseh R, Lopez JM & Blackburn HM (2016)
Characterisation of overturning flow in a precessing cylinder 20AFMC Perth, December. PDF

Gómez F, Sharma AS & Blackburn HM (2016)
Estimation of fluctuating pressure fields via time-mean flow and pointwise measurements 20AFMC Perth, December. PDF

Albrecht T, Blackburn HM, Lopez JM, Manasseh R & Meunier P (2016)
Components of mean streaming slow in a precessing cylinder at small nutation angles 24th ICTAM Montreal, August. PDF

Rudman M, Singh J, Blackburn HM, Chryss A, Graham LJ & Pullum L (2015)
The importance of rheology shear rate range for DNS of turbulent flow of yield stress fluids 17 Transport & Sedimentation Delft, September. PDF

Albrecht T, Blackburn HM, Meunier P, Manasseh R & Lopez JM (2015)
PIV of a precessing cylinder flow at large tilt angles TSFP9 Melbourne, June. PDF

Gómez F, Blackburn HM, Rudman M, Sharma AS & McKeon BJ w (2015)
Manipulating flow structures in turbulent pipe flow TSFP9 Melbourne, June. PDF

Smith DM, Blackburn HM & Sheridan J (2014)
Linear stability analysis for an optimum Glauert rotor modelled by an actuator disk J Phys: Conf Ser 524:012150 PDF

Nemes A, Sherry M, Lo Jacono D, Blackburn HM & Sheridan J (2014)
Evolution and breakdown of helical vortex wakes behind a wind turbine J Phys: Conf Ser 555:012077 PDF

Rowcroft J, Burton D, Blackburn HM & Sheridan J (2014)
Surface flow visualisation over forward facing steps varying yaw angle J Phys: Conf Ser 555:012086 PDF

Saha S, Ooi ASH & Blackburn HM (2014)
Validation criteria for DNS of turbulent heat transfer in pipe flow Proc Eng 90: 599–604. PDF

Gómez F, Blackburn HM, Rudman M, McKeon BJ & Sharma AS (2014)
Reconstruction of turbulent pipe flow using resolvent modes: application to low-order models and flow control 19AFMC Melbourne, December. PDF

Albrecht TA, Meunier P, Manasseh R, Lopez JM & Blackburn HM (2014)
PIV of a precessing cylinder flow at small tilt angles 19AFMC Melbourne, December. PDF

Blackburn HM, Albrecht TA, Manasseh R, Lopez JM & Meunier P (2014)
Instability in a precessing cylinder flow 19AFMC Melbourne, December. PDF

Hartl K, Blackburn HM & Smits A (2014)
Experimental and numerical study of laboratory fire whirls 19AFMC Melbourne, December. PDF

Loh SA, Blackburn HM & Sherwin SJ (2014)
Response of an airfoil separation bubble to optimal initial and inflow perturbations 19AFMC Melbourne, December. PDF

Saito N, Pullin DI & Blackburn HM (2014)
Large-eddy simulations of turbulent flow in a smooth-walled pipe at large Reynolds numbers 19AFMC Melbourne, December. PDF

Singh J, Rudman M & Blackburn HM (2014)
Turbulent flow of non-Newtonian fluids in a partially blocked pipe 19AFMC Melbourne, December. PDF

Smith DM, Blackburn HM, Gómez F & Sheridan J (2014)
Three dimensional stability analysis of an optimum rotor 19AFMC Melbourne, December. PDF

Vincent M & Blackburn HM (2014)
Simulation of starting/stopping vortices for a lifting aerofoil 19AFMC Melbourne, December. PDF

Xie DF, Blackburn HM & Sheridan J (2014)
Separation of yawed turbulent flows over a forward-facing ramp 19AFMC Melbourne, December. PDF

Blackburn HM, Albrecht TA, Manasseh R, Lopez JM & Meunier P (2014)
DNS and PIV investigation of nonlinear instability in a precessing cylinder flow APS DFD San Francisco, CA, November.

Albrecht TA, Meunier P, Blackburn HM, Lopez JM & Manasseh R (2014)
Precessional forcing of a mean geostrophic flow in a rotating cylinder APS DFD San Francisco, CA, November.

Gómez F, Blackburn HM, Rudman M, McKeon BJ, Luhar M, Moareff R & Sharma AS (2014)
Sparse energetically dominant frequencies in direct numerical simulation of turbulent pipe flow: origin and application to reduced-order models APS DFD San Francisco, CA, November.

Gómez F, Blackburn HM, Rudman M, Sharma AS & McKeon BJ (2014)
Static transpiration control in turbulent pipe flow: direct numerical simulation and resolvent analysis 10th ERCOFTAC SETMM Marbella, Spain, September.

Gómez F, Blackburn HM, Rudman M, Sharma AS & McKeon BJ (2014)
On the coupling of direct numerical simulation and resolvent analysis iTi 2014 Bertinoro, Italy, September.

Smith DM, Blackburn HM & Sheridan J (2014)
Linear stability analysis for an optimum Glauert rotor modelled by an actuator disc Torque from the Wind, Copenhagen, June.

Saito N, Pullin D & Blackburn HM (2013)
Large-eddy simulation of turbulent pipe flow at large Reynolds number APS DFD Pittsburgh, PA, November.

Loh SA, Blackburn HM & Mao X (2013)
Optimal divergence-free inflow perturbations in flow over an airfoil APS DFD Pittsburgh, PA, November.

Smith DM, Blackburn HM & Sheridan J (2013)
Stability of a wind turbine wake subject to root vortex perturbations APS DFD Pittsburgh, PA, November.

Xie DF, Blackburn HM & Sheridan J (2013)
DNS of yaw effects on turbulent flows over a forward-facing ramp ETC14 Lyon, September.

Blackburn HM, Mao X & Sherwin SJ (2012)
Computing optimal flow perturbations 18AFMC, Launceston, December. PDF Slides

Saha S, Klewicki JC, Ooi ASH & Blackburn HM (2012)
A comparison of meso-scaled heat flux and temperature in fully-developed turbulent pipe and channel flows 18AFMC, Launceston, December.

Nebauer JRA & Blackburn HM (2012)
On the stability and optimal growth of time-periodic pipe flow 18AFMC, Launceston, December.

Rudman M & Blackburn HM (2012)
Turbulence modification in shear-thinning fluids: preliminary results for power law rheology 18AFMC, Launceston, December.

Nemes A, Sherry M, Lo Jacono D, Blackburn HM & Sheridan J (2012)
Generation, evolution and breakdown of helical vortex wakes 18AFMC, Launceston, December.

Zhu SJ, Ooi A & Blackburn HM (2012)
Development of an OpenFOAM tool for bubble transport studies in a propeller flow 18AFMC, Launceston, December.

Nebauer JRA & Blackburn HM (2012)
Floquet stability of time-periodic pipe flow 9th Int Conf CFD Minerals & Proc. Ind. Melbourne, December.

Mao X, Blackburn HM & Sherwin SJ (2012)
Optimal suppression of unsteadiness in incompressible flow XXIII ICTAM, Beijing, August.

Saha S, Klewicki JC, Ooi ASH & Blackburn HM (2012)
On the development of a logarithmic mean temperature profile in fully developed turbulent pipe flow with constant surface heat flux Turb Heat Mass Trans 7 Palermo, Sept.

Perez JM, Gómez F, Blackburn HM & Theofilis V (2012)
A shift-invert strategy for global flow instability analysis using matrix-free methods AIAA 42nd Fluid Dyn Conf New Orleans, June. AIAA paper 2012–3276. PDF

Saha S, Ooi ASH & Blackburn HM (2012)
Heat transfer enhancement through wavy pipe 9th A/Asian HMT Conf Melbourne, Nov.

Blackburn HM, Hall P & Sherwin SJ (2011)
Semi-asymptotic methodology for vortex-wave interaction applied to computing equilibria in parallel shear flow BIFD 2011 Barcelona, July.

Zhu SJ, Blackburn HM, Anderson B & Ooi ASH (2010)
Towards large eddy simulation of bubble dispersion in high Reynolds number wake flows 17AFMC, Auckland, December.

Saha S, Chin CC, Blackburn HM, & Ooi ASH (2010)
Numerical study of heat transfer in a fully develeoped turbulent pipe flow 17AFMC, Auckland, December.

Dawson STM & Blackburn HM (2010)
Numerical simulation of a bifurcating jet within a radially confined domain 17AFMC, Auckland, December.

Smith DM & Blackburn HM (2010)
Transient growth analysis for axisymmetric pulsatile pipe flows in a rigid straight circular pipe 17AFMC, Auckland, December.

Sheard GJ & Blackburn HM (2010)
Steady inflow though a model aneurysm: global and transient stability 17AFMC, Auckland, December.

Batchelor R, Blackburn HM & Manasseh R (2010)
Simulations of axisymmetric inertial waves in a rotating container of fluid 17AFMC, Auckland, December. PDF

Loh SA & Blackburn HM (2010)
Stability of steady flow through a corrugated pipe 17AFMC, Auckland, December.

Nebauer JRA & Blackburn HM (2010)
On the stability of time-periodic pipe flow 17AFMC, Auckland, December.

Blackburn HM, Hall P & Sherwin SJ (2010)
Critical layer structure in transitional Couette flows APS DFD Long Beach, CA, November.

Blackburn HM, Mao X & Sherwin SJ (2010)
Lagrangian-based methods for computing optimal boundary perturbations ERCOFTAC SIG33 TMPC, Nice, July.

Stiller J, Koal K, Blackburn HM & Serre E (2010)
SVV kernels for LES in cylindrical coordinates ERCOFTAC ETMM 8, Marseille, June.

Zhu SJ, Ooi A, Blackburn HM & Anderson B (2010)
Validation of numerical model for bubble dispersion over a hydrofoil Oceans 10, Sydney, May.

Nebauer JR & Blackburn HM (2009)
Stability of oscillatory and pulsatile pipe flow 7th Int Conf CFD Minerals & Proc. Ind., Melbourne, December.

Zhu SJ, Ooi A, Blackburn HM & Anderson B (2009)
Numerical simulatons of bubble dispersion over a hydrofoil 7th Int Conf CFD Minerals & Proc. Ind., Melbourne, December.

Chin CC, Ooi A, Marusic I & Blackburn HM (2009)
Effects of computation pipe length on turbulence statistics using DNS of turbulent pipe flow APS DFD Minneapolis, MN, November.

Zhu SJ, Ooi A, Blackburn HM & Anderson B (2009)
Numerical simulations of bubble dispersion over a hydrofoil APS DFD Minneapolis, MN, November.

Chin CC, Ooi A, Marusic I & Blackburn HM (2009)
Effects of computation pipe length on turbulence statistics using DNS of turbulent pipe flow EAPW09 Portland, OR, November.

Blackburn HM, Sherwin SJ & Barkley D (2009)
Global stability and transient growth in physiological-type flows Global Flow Instability and Control IV, Crete, September.

Blackburn HM (2009)
Oscillating cylinders, oscillating flows From fast cars to slow flows over bluff bodies, Imperial College, June.

Blackburn HM, Sherwin SJ & Barkley D (2009)
Computing optimal growth behaviour for pulsatile stenotic flows ICOSAHOM 09, Trondheim, June.

Koal K, Stiller J & Blackburn HM (2009)
SVV-LES of elctromagnetically driven flows in cylindrical cavities ICOSAHOM 09, Trondheim, June.

Blackburn HM, Mao, X & Sherwin SJ (2009)
Transient growth in stenotic flow with a physiologically realistic waveform APAB 09, Christchurch, April.

Blackburn HM, Sherwin SJ & Barkley D (2008)
Optimal transient disturbances in stenotic flows APS DFD, San Antonio, TX, November.

Stiller S, Koal K & Blackburn HM (2008)
Turbulence in electrically conducting fluids driven by rotating and travelling magnetic fields iTi Conf Turbulence III, Bertinoro, Italy, October.

Blackburn HM, Sherwin SJ & Barkley D (2008)
Computation of convective instability in complex geometry flows XXII ICTAM, Adelaide, August.

Sherwin SJ, Blackburn HM & Barkley D (2008)
Direct optimal growth analysis for timesteppers AIAA 4th Flow Control Conf, Seattle, June. AIAA-2008-4231

Blackburn HM, Ooi A & Chong MS (2007)
The effect of corrugation height on flow in a wavy-walled pipe 16AFMC, Gold Coast, December. PDF

Ooi A, Blackburn HM, Zhu S, Lui E & Tae W (2007)
Numerical study of the behaviour of wall shear stress in pulsatile stenotic flows AFMC16, Gold Coast, December.

Noui-Mehidi NM, Blackburn HM & Ohmura N (2007)
Laminar spirals in the outer stationary cylinder Couette–Taylor system 16AFMC, Gold Coast, December. PDF

Barkley D, Blackburn HM, Sherwin SJ (2007)
Convective instability and transient growth in flow over a backward-facing step APS DFD, Salt Lake City, UT, November.

Blackburn HM, Barkley D & Sherwin SJ (2007)
Optimal growth of flow instabilities in arbitrary geometries ICOSAHOM 07, Beijing, June.

Blackburn HM & Sherwin SJ (2007)
Computed instability and transition of pulsatile stenotic flow ICOSAHOM 07, Beijing, June.

Sherwin SJ, Blackburn HM & Barkley D (2007)
Spectral/hp stability analysis of complex geometry flows 14th Intnl Conf Finite Elements in Flow Problems, Santa Fe, NM, May.

Blackburn HM & Sherwin SJ (2006)
Instability modes and transition of pulsatile stenotic flow Australian Workshop on Fluid Mech Melbourne, December.

Blackburn HM & Sherwin SJ (2006)
Instability, transition and receptivity of pulsatile flow in a stenotic tube 5th Int Conf CFD Minerals & Proc. Ind. Melbourne, December.

Blackburn HM & Sherwin SJ (2006)
Instability modes and transition of pulsatile stenotic flow APS DFD Tampa, FL, November.

Blackburn HM & Sherwin SJ (2006)
Convective and absolute instability of pulsatile stenotic flow 3rd Intnl Sympo. Modelling of Physiological Flows Bergamo, September.

Sherwin SJ & Blackburn HM (2006)
Direct simulation of turbulence and transition in steady and pulsatile flow in a model stenotic geometry 5th World Cong Biomech, Munich, July.

Sherwin SJ & Blackburn HM (2006)
Instability and transition of pulsatile flow in stenotic/constricted pipes Euromech 2006, Stockholm, June.

Prakash, M, Cleary, PW, Ha, J, Noui-Mehidi MN, Blackburn HM, & Brooks G (2005)
Simulation of suspension of solids in a liquid in a mixing tank using SPH and comparison with physical modelling experiments 4th Int Conf CFD in Oil & Gas, Metallurgical and Process Industies, Trondheim, June.

Elston JR, Sheridan J & Blackburn HM (2005)
Three-dimensional Floquet stability analysis of the flow produced by an oscillating cylinder in quiescent fluid BBVIV4 Santorini, June.

Noui-Mehidi MN, Blackburn HM, Manasseh R, Brooks G & Rudman M (2005)
An experimental study on floating solids in a liquid bath EPD Cong, TMS Annual Meeting San Francisco, CA, February.

Blackburn HM, Lopez JM & Marques F (2004)
Three-dimensional quasi-periodic instabilities of two-dimensional time-periodic flows 15AFMC Sydney, December. PDF

Blackburn HM & Sherwin SJ (2004)
Three-dimensional instabilities and transition in pulsatile stenotic flows 15AFMC Sydney, December. PDF

Schmidt S, Blackburn HM & Rudman M (2004)
Impact of outlet boundary conditions on the flow properties in a cyclone 15AFMC Sydney, December. PDF

Leung JJF, Hirsa AH, Blackburn HM, Marques F & Lopez JM (2004)
Three-dimensional modes in a periodically driven elongated cavity APS DFD Seattle, WA, November.

Marques F, Lopez JM & Blackburn HM, (2004)
Symmetry breaking of two-dimensional time-periodic wakes APS DFD Seattle, WA, November.

Sherwin SJ & Blackburn HM (2004)
Three-dimensional instabilities of steady and pulsatile axisymmetric stenotic flows APS DFD Seattle, WA, November.

Blackburn HM & Sherwin SJ (2004)
A new spectrally convergent spectral element–Fourier formulation for solution of Navier–Stokes problems in cylindrical coordinates ICOSAHOM 2004 Brown University, RI, June.

Marques F, Lopez JM & Blackburn HM (2004)
Sobre las inestabilidades tridimensionales de flujos bidimensionales con simetría espacio-temporal Z2 Nolineal 2004 Universidad de Castilla–La Mancha, June.

Sherwin SJ & Blackburn HM (2003)
BiGlobal instabilities of steady and pulsatile flow in a 75% axisymmetric stenotic tube Intnl Bio-Fluid Symposium and Workshop Caltech, USA, December. PDF

Schmidt S, Blackburn HM, Rudman M & Sutalo I (2003)
Simulation of turbulent flow in a cyclonic separator 3rd Int Conf CFD Minerals & Proc. Ind. Melbourne, December.

Rudman M & Blackburn HM (2003)
The effect of shear-thinning behaviour on turbulent pipe flow 3rd Int Conf CFD Minerals & Proc. Ind. Melbourne, December.

Leung JJF, Hirsa, AH, Lopez JM & Blackburn HM (2003)
Endwall effects in periodically driven cavity flow APS DFD Meadowlands, NJ, November.

Blackburn HM & Sherwin SJ (2003)
Floquet stability analysis of non-axisymmetric pulsatile stenotic flows World Cong Med Phys & Biomed Eng Sydney, August.

Elston JR, Sheridan J & Blackburn HM (2002)
Two-dimensional Floquet stability analysis of the flow produced by an oscillating cylinder in quiescent fluid BBVIV3 Port Douglas, December.

Vogel M, Hirsa AH, Lopez JM & Blackburn HM (2002)
Spatio-temporal dynamics of a periodically driven cavity flow APS DFD Dallas, TX, November.

Rudman M & Blackburn HM (2003)
Turbulent pipe flow of non-Newtonian fluids Computational Fluid Dynamics 2002 Eds S Armfield, P Morgan & K Srinivas: Springer, 687–692.

Rudman M & Blackburn HM (2002)
Turbulent pipe flow of non-Newtonian fluids Int Conf CFD 2 Sydney, July.

Rudman M, Graham LJW, Blackburn HM & Pullum L (2002)
Non-Newtonian turbulent and transitional pipe flow 15th Int Conf Hydrotransport Banff, June.

Blackburn HM (2003)
Computational bluff body fluid dynamics and aeroelasticity Coupling of Fluids, Structures and Waves Problems in Aeronautics Eds NG Barton & J Periaux: Springer, Notes in Numerical Fluid Mechanics, 10–23. PDF

Blackburn HM (2001)
Computational bluff body fluid dynamics and aeroelasticity CSIRO/CNRS/Dassault Workshop on Coupling of Fluids, Structures and Waves in Aeronautics Melbourne, December.

Blackburn HM & Lopez JM (2001)
Symmetry breaking to modulated rotating waves in an enclosed swirling flow 14AFMC Adelaide, December. 179–182. PDF

Blackburn HM & Schmidt S (2001)
Large eddy simulation of flow past a circular cylinder 14AFMC Adelaide, December. 689–692. PDF

Elston JR, Sheridan J & Blackburn, HM (2001)
The transition to three-dimensionality in the flow produced by an oscillating circular cylinder 14AFMC Adelaide, December. 319–322. PDF

Rudman M, Blackburn HM, Graham LJW & Pullum L (2001)
Weakly turbulent pipe flow of a power law fluid 14AFMC Adelaide, December. 925–928. PDF

Schmidt S & Blackburn HM (2001)
Spectral element based dynamic large eddy simulation of turbulent channel flow 14AFMC Adelaide, December. 391–394. PDF

Schmidt S, McIver DM, Blackburn HM, Rudman M & Nathan GJ (2001)
Spectral element based simulation of turbulent pipe flow 14AFMC Adelaide, December. 917–920. PDF

Elston JR, Blackburn HM & Sheridan J (2000)
The onset of three-dimensionality in the flow generated by an oscillating cylinder APS DFD Washington, DC, November.

Lopez JM, Marques F, Sanchez J & Blackburn HM (2000)
Multiple unsteady solutions and symmetry breaking in a confined swirling flow APS DFD Washington, DC, November.

Blackburn HM, Govardhan R & Williamson CHK (2000)
A complementary numerical and physical investigation of vortex-induced vibration IUTAM Sympo Bluff Body Wakes & VIV Marseille, June.

Blackburn HM (2000)
Sidewall boundary layer instabilities in confined swirling flow Advances in Turbulence VIII Ed C Dopazo: CIMNE, 607–610.

Blackburn, HM (2000)
Sidewall boundary layer instabilities in confined swirling flow 8th European Turbulence Conf Barcelona, June.

Rudman M & Blackburn HM (1999)
Large eddy simulation of turbulent pipe flow 2nd Intnl Conf CFD in Minerals & Process Ind Melbourne, December. PDF

Blackburn, HM (1999)
Domain decomposition with Robin boundary conditions across a phase interface CTAC99 Canberra, September.

McIver DM, Blackburn HM & Nathan GJ (1999)
Spectral element–Fourier methods applied to turbulent pipe flow CTAC99 Canberra, September.

Blackburn HM (1998)
Channel flow LES with spectral elements 13AFMC Melbourne, December, 989–992. PDF

Blackburn, HM (1998)
A comparison of two- and three-dimensional wakes of an oscillating circular cylinder 13AFMC Melbourne, December, 749–752. PDF

Rudman M & Blackburn HM (1998)
Turbulent Taylor–Couette flow 13AFMC Melbourne, December, 163–166. PDF

Blackburn HM, Elston JR & Sheridan J (1998)
Flows created by a cylinder with oscillatory translation and spin ASME Fluids Engng Div. Summer Meeting Washington DC, June, FEDSM98–5157.

Rudman M, Blackburn HM & Merrell J (1997)
Bubble rise in an inclined channel Intnl Conf CFD in Min, Met Proc & Power Gen Melbourne, July. PDF

Niclasen RD & Blackburn, HM (1997)
Gauss and Gauss–Lobatto element quadratures applied to the incompressible Navier–Stokes equations CTAC97 Adelaide, September, 457–464. PDF

Niclasen RD, Rudman M, Blackburn HM & Wu J (1997)
Flow simulation of a mixing vessel incorporating blade element theory Intnl Conf CFD in Min, Met Proc & Power Gen Melbourne, July, 395–401.

Welsh MC, Pullum L, Downie RJ, Cooper PI & Blackburn HM (1996)
The role of small-scale physical modelling of fluid dynamic processes in mineral processing Adv Alumina Tech Darwin, June, ii–xvi.

Blackburn HM & Henderson RD (1995)
Near-wake vorticity dynamics in bluff body flows 12AFMC Sydney, December, 17–20.

Niclasen RD & Blackburn HM (1995)
A comparison of mass-lumping techniques for the two-dimensional Navier–Stokes equations 12AFMC Sydney, December, 17–20.

Blackburn HM & Henderson RD (1995)
Phase control of vortex shedding during lock-in APS DFD 40(12) Irvine, California, November.

Blackburn HM & Henderson RD (1995)
Wake dynamics in flow past an oscillating cylinder Numerical Methods in Laminar & Turbulent Flow IX Eds C Taylor & P Durbetaki: Pineridge Press, 1479–1490.

Blackburn HM & Henderson RD (1995)
Wake dynamics in flow past an oscillating cylinder 9th Intnl Conf Num Meth Laminar & Turb Flow Altanta, July, 1479–1490.

Blackburn HM & Henderson RD (1994)
Progress in simulation of vortex-induced vibration AWES 4th National Workshop Sydney, October.

Blackburn HM & Henderson RD (1994)
Body-wake interaction during vortex-induced vibration Intnl Colloq Jets, Wakes & Shear Layers Melbourne, April.

Blackburn HM & Karniadakis GE (1993)
Two- and three-dimensional simulations of vortex-induced vibrations of a circular cylinder 3rd Intnl Offshore & Polar Engng Conf Singapore, June, 715–720. PDF

Blackburn HM & Melbourne WH (1992)
Cross flow response prediction of slender circular-cylindrical structures: prediction models and recent experimental results BBAA2 Hobart, December.

Blackburn HM, Cantwell BJ & Mansour NM (1992)
Topological characteristics of incompressible channel flow APS DFD Tallahasee, Florida, November.

Blackburn, HM & Melbourne, WH (1991)
Lift on an oscillating cylinder in smooth and turbulent flow 8th Intnl Conf Wind Engng Ontario, June.

Blackburn HM & Melbourne WH (1991)
Promotion of instability during lock-in AWES 4th National Workshop Polkolbin, February.

Blackburn HM & Melbourne WH (1989)
Measurements of coefficients of lift and spanwise correlation for a circular cylinder oscillating in a turbulent flow 10AFMC Melbourne, December.

Blackburn HM & Melbourne WH (1989)
Frequency and time domain cancellation of inertial signal from an accelerating force transducer Workshop Ind Fluid Dyn., Heat Trans. & Wind Engng Melbourne, December.

Manohar SM, Blackburn HM & Melbourne WH (1989)
Aerodynamic wind effects on a tall chimney 2nd Asia–Pacific Symp Wind Engng Beijing, June, 764–771.

Blackburn HM & Melbourne WH (1989)
Measurements of sectional lift forces on an oscillating cylinder 2nd Asia–Pacific Symp Wind Engng Beijing, June, 322–339.

Attwood R & Blackburn HM (1984)
Predicted moisture loss from soft brown coal during transport by overland conveyor Transportation Conference 84/9, IEAust Perth, 43–46.

Thesis

Lift on an oscillating cylinder in smooth and turbulent flows, Department of Mechanical Engineering, Monash University, 1992. FrontmatterChapter 1Chapter 2Chapter 3Chapter 4Chapter 5Chapter 6Chapter 7Appendix AAppendix BAppendix C.

*You may download copies of papers for personal use; any other use requires prior permission of the author and publisher.

Irrigation history

Pioneering Irrigation in Australia to 1920 is a book by my father, Gerard Blackburn. Please follow this link to view bibliographic and publication details.

Semtex DNS code

Semtex is my direct numerical simulation CFD code that uses the ‘classical’ nodal spectral element method as the underlying discretisation. Semtex was used to generate most of the simulation results described above, and is also the base code for most of the work described in the publications listed below. It is released for public use under the terms of the Gnu General Public License (GPL).

Summary

Semtex is a ‘classical’ quadrilateral spectral element DNS code that uses the standard nodal GLL basis functions and (optionally) Fourier expansions in a homogeneous direction to provide three-dimensional solutions. If your problem has a natural periodic coordinate direction in 3D (a cylindrical coordinate system is perhaps the most obvious example), semtex could be a good choice. For 3D problems of this kind, the code can run in parallel using MPI to distribute jobs over a number of processes; semtex is equally at home on Unix machines from laptop to supercomputer.

The code’s lineage can be traced back through Ron Henderson’s prism code and ultimately to the original spectral element code nekton — in many ways the implementation is similar to prism (see Henderson & Karniadakis (1995) J Comput Phys 122: 191–217) but without mortar element patching or mesh adaptation. One noteworthy difference is that semtex supports cylindrical as well as Cartesian coordinates, and with full spectral convergence in all directions: see Blackburn & Sherwin (2004) J Comput Phys 197: 759–778 for a detailed description of the method. The user is able to include a range of distributed body forces, such as Euler and Coriolis forces. In addition to an incompressible Navier–Stokes solver, source is also provided for an elliptic solver that will deal with Laplace, Poisson and Helmholtz problems.

Please note that semtex is a research code and is provided ‘as-is’ with the understanding that it will be used mainly by other computer-literate researchers in computational fluid dynamics. It is not guaranteed to work or to provide correct results, and neither I or any employer accept any liability for detriment or loss consequent on your use of the code. Please see the terms of the Gnu General Public License (GPL) under which the code is released for public use. On the other hand, I’d be happy to hear of your experiences with using the code and your types of applications and results.

If through your use of the code you manage to obtain publishable results, I would be pleased if you could cite Blackburn & Sherwin (2004), where the numerical method is described in some depth, particular to the cylindrical-coordinate formulation.

(September 2015) Release of accompanying Dog linear flow stability analysis software package. This enables eigenmodal flow stability analysis of two-dimensional flows with either two- or three-component velocity fields which may either be steady or periodic in time. Additionally the package will compute optimal initial conditions for finite-time transient growth. See description of the method in Barkley, Blackburn & Sherwin (2008), and the user guide below.

(September 2015) Release of accompanying Scat scalar transport extension to standard Semtex DNS. Includes Boussinesq buoyancy. See description of the method in Hartl, Blackburn & Smits (2014).

Installation

Semtex has been compiled and run on a variety of Unix systems. Consult the user guide for system requirements and compilation steps. As a minimum, your system will need C++, C and F77 (or later FORTRAN) compilers, the Gnu version of make, yacc (or bison), as well as BLAS and LAPACK libraries and their associated header files. For parallel compilation you’ll need MPI libraries and headers. Most of these things are readily available on modern Unix systems. The starting point if you have difficulty compiling (after consulting the user guide) is src/Makefile — quite likely you will find a set of compiler flags for a machine similar to the one you have, and reading it may help you diagnose and fix the problem.

I’m afraid that I do not have much time to answer routine questions about making semtex compile, running examples, etc. Please consult the user guide for information on these matters. I will be happy to hear of bugs, and even better, suggestions about how to fix them, although I cannot promise to remedy problems on a timely basis (and a big thank you to those who have contributed fixes to some niggling bugs). The source code distribution is occasionally updated, however, the code is quite mature now and does not often change.

Mesh generation

Mesh generation can be a significant hurdle to new users. The source distribution provides two utilities that can be used as a starting point: rectmesh that generates semtex structured rectangular meshes and mapmesh which will map such a mesh (or any other semtex mesh) according to functions supplied on the command line. In addition there are a number of example meshes supplied in the ‘mesh’ subdirectory of the source distribution (most of which were generated by hand).

We supply two utilities that work with 3rd-party mesh generators, and a link to a 3rd-party converter for Fluent meshes.

Gmsh2sem, a python script that will produce semtex session files from quad meshes generated by gmsh (open-source: see http://www.geuz.org/gmsh/). This utility is included in the current source code distribution.

Gambit2semtex, a FORTAN-based converter from Fluent Inc’s gambit mesh generator format to semtex session file format. Written by Erik Torres and Jörg Stiller from the ILR group at TU-Dresden, has user guides in German and English. With the deletion of gambit from the Ansys code suite, note that the Ansys workbench Fluent .msh format is the same as gambit‘s, albiet in binary. To get an ASCII .msh file (the starting point for gambit2semtex), set environment variable AWP_WRITE_FLUENT_MESH_ASCII=1 before using workbench.

Mshconvert is a python script for converting a fluent mesh (.msh) to a session file file that can be read by semtex (alternatively also .rea files for Nek5000). Developed by Mikael Mortensen at University of Oslo.

Postprocessing and visualisation

A number of tools are distributed with the code (in the utilities directory) that will aid in postprocessing. These include tools for addition of derived fields such as vorticity and energy, data extraction on points, lines or planes, data projection/interpolation and computation of Reynolds stresses.

While the user guide shows a number of visualisations made with the commercial Tecplot code, both VisIt and Paraview should be able to read Tecplot .plt files too. One can alternatively convert output data files to VTK format, also readable by VisIt or Paraview. I suggest that for simple isosurface visualisation tasks, the most convenient and quickest way to examine 3D semtex solution files is with the sview utility, coded in openGL, which works directly with semtex mesh and 3D field file dumps. Scriptable and/or interactive, sview can also generate TIFF output.

Downloads

Semtex release 8.2 (December 2015). This version implements the robust outflow boundary condition of Dong, Karniadakis and Chryssostomides (JCP 261, 2014) that allows stable simulation of open flows which have severely truncated outflow regions.

Dog release 2.0 (September 2015). Linear flow stability analysis package that builds with Semtex release 8. Unpack at same level as Semtex (not within it).

Scat release 6.1 (June 2017). Extension of DNS code in Semtex to include transport of a single scalar field. Includes gravitational and (optionally) centrifugal Boussinesq buoyancy terms — check the README guide for further explanation. Builds with Semtex release 8. Unpack at same level as Semtex (not within it).

Sview tarball: openGL-based isosurface visualisation tool, works directly with semtex mesh and 3D field file dumps. Scriptable and/or interactive, generate TIFF output. This is typically the quickest way to visualise 3D solutions.

User guides and notes

Semtex user guide (PDF) including decription of generalised body forces, a simple introduction to using semtex to study DNS of turbulent channel flow, and some information on the API.

Dog user guide (PDF).

Slides (PDF) from 2015 Crete-VI summer school on global flow stability analysis.

Brief guide on how to install and use Semtex on a Linux machine (PDF). Contributed by Trevor Batty.

Links

Hugh Blackburn’s home page.

Semtex-related publications.

Nektar++ spectral element code project (Spencer Sherwin and Mike Kirby).

Nek5000 spectral element code project (Paul Fischer).

Monash UAS

Last modified: 18/07/2018