Rotating Four-way Flow

There are four inflows on a circle rotating clockwise. An outflow is located in the upper middle of the right wall. The flow is visualized by a shaded velocity plot. That configuration was a homework for the course "Numerische Strömungssimulation und Realisierung in FEATFLOW" (numerical simulation of flows and implemention in FEATFLOW) that was held in WS 1999/2000.