3 papers
physics.flu-dyn2025
Lighthill's mechanism and vorticity cascade in the logarithmic layer of wall turbulence
Samvit Kumar, Simon Toedtli, Tamer A. Zaki +1
We investigate Lighthill's proposed turbulent mechanism for near-wall concentration of spanwise vorticity by calculating mean flows conditioned on motion away from or toward the wa…
physics.flu-dyn2024
A Josephson-Anderson relation for drag in classical channel flows with streamwise periodicity: Effects of wall roughness
Samvit Kumar, Gregory Eyink
The detailed Josephson-Anderson relation equates instantaneous work by pressure drop over any streamwise segment of a general channel and wall-normal flux of spanwise vorticity spa…
physics.flu-dyn2023
Vorticity cascade and turbulent drag in wall-bounded flows: plane Poiseuille flow
Samvit Kumar, Charles Meneveau, Gregory Eyink
Drag for wall-bounded flows is directly related to flux of spanwise vorticity outward from the wall. In turbulent flows a key contribution arises from cross-stream "vorticity casca…