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For Normal flow it sets the tangential velocity component to zero.
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For Swirl flow (which is available for 3D or 2D axisymmetric when the Swirl flow check box in the Physical Model section is selected) it specifies a swirl flow on the downstream side of the fan based on the Rotation axis base point rbp, Revolutions per time f, Rotational direction and Swirl ratio csf.
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For User defined an Inflow velocity direction du (dimensionless) should be specified. The magnitude of du does not matter, only the direction. du must point into the domain.
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The Interior Fan feature uses the flux across the boundary selection. This feature is not designed to be used on disjoint selections. If the model includes several fans on boundaries that are not connected, it is good practice to use different Fan or Interior Fan features with connected boundaries.
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