112 citations · 160 across the 4 of their papers we have counts for
6 papers · 1 filter
Bifurcation and stability of downflowing gyrotactic micro-organism suspensions in a vertical pipe
Lloyd Fung, Rachel N. Bearon, Yongyun Hwang
In the experiment that first demonstrated gyrotactic behaviour of bottom-heavy swimming microalgae (e.g. Chlamydomonas), Kessler (Nature, vol. 313, 1985, pp. 218-220) showed that a…
Instability of tilted shear flow in a strongly stratified and viscous medium
Lloyd Fung, Yongyun Hwang
A linear stability analysis is performed on a tilted parallel wake in a strongly stratified fluid at low Reynolds numbers. A particular emphasis of the present study is given to th…
Self-sustaining process of minimal attached eddies in turbulent channel flow
Yongyun Hwang, Yacine Bengana
It has been recently shown that the energy-containing motions in turbulent channel flow exist in the form of Townsend's attached eddies by a numerical experiment which simulates th…
The instability of gyrotactically-trapped cell layers
Smitha Maretvadakethope, Eric E. Keaveny, Yongyun Hwang
Several meters below the coastal ocean surface there are areas of high ecological activity that contain thin layers of concentrated motile phytoplankton. Gyrotactic trapping has be…
Streak instability in turbulent channel flow: the seeding mechanism of large-scale motions
Matteo de Giovanetti, Hyung Jin Sung, Yongyun Hwang
It has often been proposed that the formation of large-scale motion (or bulges) is a consequence of successive mergers and/or growth of near-wall hairpin vortices. In the present s…
Coherent structures in fully-developed pipe turbulence
A. P. Willis, Y. Hwang, C. Cossu
A turbulent mean profile for pipe flow is prescribed which closely matches experimental observations. The nature of perturbations superimposed upon this profile is then considered.…