Vorticity field in subcritical rotating convection in a liquid metal planetary core

2017-09-05T21:39:06Z (GMT) by Nathanael Schaeffer
3D visualization of the vorticity field in a simulation of thermal convection in the liquid metal (Prandtl number Pr=0.01) of a rapidly rotating planetary core (Ekman number Ek=1e-7). The linear theory predicts a stable core (no motion). The motion are therefore called sub-critical and exist due to non-linear effects.<br><br>The equatorial plane shows the stream lines (using paraview's surface-LIC) on top of the vorticity field (blue to yellow) while the transparent meridional plane shows only the vorticity (blue to yellow) that is remarkably invariant along the rotation axis, a characteristic of the rapidly rotating convection regime.<br><br>