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Plot of the isosurfaces of the z-component of the non-dimensional vorticity, ωz L/u0, for the Taylor-Green vortex problem at non-dimensional times tu0/L = 0 (ωz L/u0 = ±0.33, left) and tu0/L = 10 (ωz L/u0 = ±0.67, right). Note that the negative and positive isosurfaces of ωz L/u0 are colored in black and gray, respectively.
