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Viscous diffusion of multiple vortex system

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The following analytical solution satisfies the incompressible continuity and momentum equations in dimension-less form in the domain 0 \le x, y \le 2\pi. The solution is periodic in both x and y coordinates.


u(x,y,t) = -\cos x \sin y e^{-2t/Re}

v(x,y,t) =  \sin x \cos y e^{-2t/Re}

p(x,y,t) = -0.25( \cos 2x + \cos 2y) e^{-4t/Re}
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