155 citations · 1.3k across the 34 of their papers we have counts for
26 papers · 1 filter
Suppression of turbulence and travelling waves in a vertical heated pipe
Elena Marensi, Shuisheng He, Ashley P. Willis
Turbulence in the flow of fluid through a pipe can be suppressed by buoyancy forces. As the suppression of turbulence leads to severe heat transfer deterioration, this is an import…
Designing a minimal baffle to destabilise turbulence in pipe flows
Elena Marensi, Zijing Ding, Ashley P. Willis +1
Motivated by the results of recent experiments (Kühnen et al., Flow Turb. Combust., vol. 100, 2018, pp. 919-943), we consider the problem of designing a baffle (an obstacle to the…
Upper edge of chaos and the energetics of transition in pipe flow
Nazmi Burak Budanur, Elena Marensi, Ashley P. Willis +1
In the past two decades, our understanding of the transition to turbulence in shear flows with linearly stable laminar solutions has greatly improved. Regarding the susceptibility…
Equilibria, periodic orbits and computing them
Ashley P. Willis
In this short exposition, we describe equilibria and periodic orbits in terms of the flow map, Φ, and discuss the essentials of the Jacobian-free Newton-Krylov (JFNK) method that c…
The Self-Sustaining Process in Taylor-Couette Flow
Tommy Dessup, Laurette S. Tuckerman, Jose Eduardo Wesfreid +2
The transition from Tayor vortex flow to wavy-vortex flow is revisited. The Self-Sustaining Process (SSP) of Waleffe [Phys. Fluids 9, 883-900 (1997)] proposes that a key ingredient…
Stabilisation and drag reduction of pipe flows by flattening the base profile
E. Marensi, A. P. Willis, R. R. Kerswell
Recent experimental observations (Kuehnen et al., 2018) have shown that flattening a turbulent streamwise velocity profile in pipe flow destabilises the turbulence so that the flow…