Animation of pressure -1 and -2 isosurfaces

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An animation of swirl=0.07, viscosity=.00005 simulation. From t=84.0 to t=86.0, with Δt=0.02. The partially transparent green isosurface is dimensionless pressure of -1.0. The red isosurface is dimensionless pressure of -2.0. The blue shows a square enclosing -0.2<x<0.2 and -0.2<y<0.2 at the lower boundary.