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Velocity Field

velocity field

 

DNS results for the instantaneous field of the vertical velocity component (isosurface for u3=0.03)
and for the temperature (colour code) in Rayleigh-Bénard Convection of Mercury or PbBi at Ra = 100 000.
Rising hot fluid is enclosed within the isosurface, outside is mainly down-flowing cold fluid. Compare the
much larger scales occurring in the temperature field at the same time. (Otic & Groetzbach 2003)