A 2D contour plot of a 3D finite-element CFD simulation of a Vestas V52 wind turbine in a rectangular wind tunnel. The tunnel is 1.5km x 400m x 400m; the wind speed at the inlet is 15m/s.

The contours are coloured by the normalised wind speed, to give an indication of relative velocity deficit.

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A 3D finite-element CFD simulation of a Vestas V52 wind turbine in a rectangular wind tunnel. The tunnel is 1.5km x 400m x 400m; the wind speed at the inlet is 15m/s.

The vertical and horizontal slices are coloured by the x-component of wind velocity, u.

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A finite-element CFD simulation of Marine Current Turbine Ltd's Seaflow marine turbine (the small white cylinder just off-centre), in a tidal channel 1km long and 80m deep.
The flow accelerates to 4m/s and runs for approximately 1 1/2 hours.

In this horizontal slice through the data, large-scale turbulence can clearly be seen. The flow speed peaks at just over 3.5 m/s rather than 4 m/s, due to the strong vertical velocity gradient induced by the bottom drag.

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