Dr Kengo Deguchi

Research Overview

My work has concentrated on the application of theoretical and computational methods to uncover some of the organised vortex structures on which turbulent flows are now known to evolve. The analysis of such structures serves many important clues to help us understand various engineering, physiological, geophysical and astrophysical flows.

Mathematically, those vortex structures can be regarded as the invariant solutions of Navier-Stokes equations. They form the ‘backbone’ on which chaotic attractor (turbulence) hangs. I am particularly interested in the large Reynolds number fate of the Navier-Stokes solutions, because in many practical problems Reynolds number of interest is computationally unreachable.

Selected Publications

[1] Deguchi, Kengo ; Hall, Philip. "Free-stream coherent structures in parallel boundary-layer flows". In: Journal of Fluid Mechanics. 2014 ; Vol. 752. pp. 602-625. https://doi.org/10.1017/jfm.2014.282

[2] Deguchi, Kengo. "Self-sustained states at Kolmogorov microscale". In: Journal of Fluid Mechanics. 2015 ; Vol. 781. https://doi.org/10.1017/jfm.2015.514

[3] Deguchi, Kengo. "Linear instability in Rayleigh-stable Taylor-Couette flow". In: Physical Review E . 2017 ; Vol. 95, No. 2. https://doi.org/10.1103/PhysRevE.95.021102

[4] Deguchi, Kengo. "High-speed shear-driven dynamos. Part 1. Asymptotic analysis". In: Journal of Fluid Mechanics. 2019 ; Vol. 868. pp. 176-211. https://doi.org/10.1017/jfm.2019.178

[5] Deguchi, Kengo. "Inviscid instability of a unidirectional flow sheared in two transverse directions". In: Journal of Fluid Mechanics. 2019 ; Vol. 874. pp. 979-994. https://doi.org/10.1017/jfm.2019.500