Abstract
Vorticity transport in turbulent channels under large-scale active drag control (i.e., spanwise opposed jet forcing) is investigated via direct numerical simulation of the Navier-Stokes equation. The skin-friction coefficient is newly expressed by the volume integration average of the mean flow dissipation expressed in terms of the spanwise vorticity (Ωz), and the turbulent transports of the spanwsie vorticity fluctuation are negatively correlated in the entire region. The analysis here suggests that the suppression of random spanwise-vorticity transport is the target for more effective drag reduction under the current method.
Original language | English (US) |
---|---|
Article number | 095112 |
Journal | Physics of Fluids |
Volume | 33 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1 2021 |
ASJC Scopus subject areas
- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes