The heatmap plot illustrates the speed at the current location while the streamlines and tracer particles visualize the flow direction. The time scale was slowed down by roughly a factor of three.
[1] G.H. Keetels, H.J.H. Clercx, G.J.F. van Heijst, "Fourier spectral solver for the incompressible Navier–Stokes equations with volume penalization", Proceedings of the 7th International Conference on Computational Science, Beijing, 2007, DOI:10.1007/978-3-540-72584-8_118.
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