FLUID DYNAMICS GALLERY The following two movies illustrate our new numerical method for modelling the subgrid scales (that is such small scales which a computer fails to resolve). The method computes the two-dimmensional Navier-Stokes equation which approximates large-scale vortex motions in oceans and atmospheres. Novelty of our approach is that the small-scale motions are computed dynamically and not postulated as in traditional subgrid models. In these movies, the resolved (large-scale) vorticity is shown in the lower plane and the wavepackets of the subgrid (small-scale) vorticity are shown on the top plane.
Merging of two vortices
Instability of a jet flow
2D past a cylinder at Reynolds number equal to 3900
Flow over a step
Collision of vortex dipoles I