Rpj Rudie Kunnen

TL;DR: In this article, the authors investigated the breakdown under rotation of the large-scale circulation typical for confined convection, and the convective heat transfer through the fluid layer, expressed by the Nusselt number.

TL;DR: In this article, the orientation and settling velocity of ellipsoidal particles in a spatially decaying isotropic turbulent flow are numerically investigated and it is shown that the preferential orientation of ellipssoids is disturbed by the turbulent fluctuations of the fluid forces and moments.

TL;DR: In this article, the effects of axial rotation on turbulent convective flow because of an adverse temperature gradient in a water-filled upright cylindrical vessel are investigated both direct numerical simulations and experiments applying stereoscopic particle image velocimetry.

TL;DR: The simulation results show direct confirmation of the scalings derived by Bolgiano and Obukhov for turbulence with an active scalar for both velocity and temperature statistics, and a close inspection of local turbulent length scales confirms conjectures from earlier studies that the oft-used global averages are not suited for the interpretation of structure functions.

TL;DR: The formation of localized intense vortical structures provides for intensified vertical heat transport through Ekman pumping and is counteracted by the inhibition of vertical motion by rotation as expressed in the geostrophic thermal-wind balance.