3 papers
physics.flu-dyn2026
Multiscale quasi time-periodic coherent structures in shear flows
Runjie Song, Kengo Deguchi, Genta Kawahara +1
Attempts to disentangle shear-flow turbulence often focus on identifying relatively simple solutions, such as travelling waves or periodic orbits. We show, however, that capturing…
physics.flu-dyn2025
Spatial marching with subgrid-scale local exact coherent structures in non-uniformly curved channel flow
Runjie Song, Kengo Deguchi
We propose a novel multiple-scale spatial marching method for flows with slow streamwise variation. The key idea is to couple the boundary region equations, which govern large-scal…
physics.flu-dyn2024
Linear and nonlinear instabilities in highly shear thinning fluid flow through a pipe
Xuerao He, Kengo Deguchi, Runjie Song +1
Shear-thinning fluids flowing through pipes are crucial in many practical applications, yet many unresolved problems remain regarding their turbulent transition. Using highly robus…