3 papers
physics.flu-dyn2025
Streak generation in viscosity-stratified wall-bounded flows
Anagha Madhusudanan, Simon J. Illingworth, Rama Govindarajan
Streamwise elongated flow structures, or streaks, dominate wall-bounded flows. We show that the renowned lift-up mechanism, that generates streaks, is significantly altered by visc…
physics.flu-dyn2024
Nonlinear estimation in turbulent channel flows
Jitong Ding, Simon J. Illingworth
We design a nonlinear estimator for channel flows at and . The nonlinear estimator uses a linear estimator structure based on the linearised Navier-Stokes equation…
physics.flu-dyn2024
Mode-to-mode nonlinear energy transfer in turbulent channel flows
Jitong Ding, Daniel Chung, Simon J. Illingworth
We investigate nonlinear energy transfer for channel flows at friction Reynolds numbers of and . The key feature of the analysis is that we introduce a new variabl…