3d advection equation q_t + u*q_x + v*q_y + w*q_z = 0 with swirling flow, taken from Example 11.2 in the LeVeque's paper "High-resolution conservative algorithms for advection in incompressible flow" [LeV96])
The initial data consists of q=1 for x<0.5 and q=0 for x>0.5.
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