The effect of rotation on turbulent convective flow between parallel plates has been assessed with direct numerical simulations. With increasing rotation-rate an interesting transition is observed in the vertical-velocity skewness. This transition indicates a localization of motion directed away from the wall and correlates well with changes observed in the heat flux, as well as in the thermal and viscous boundary layer thicknesses. The formation of localized intense vortical structures provides for intensified vertical heat transport through Ekman pumping. At higher rotation-rates this is counteracted by the inhibition of vertical motion by rotation as expressed in the geostrophic thermal-wind balance.
|Number of pages||4|
|Journal||Physical review E: Statistical, nonlinear, and soft matter physics|
|Publication status||Published - 21 Nov 2006|
- Numerical analysis
- confined flow
- Flow simulation
- Boundary layers