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[FAQ]

When defining a coating simulation, a conflict of boundary conditions may potentially develop at the contact point between the free surface and the subsequent moving solid boundary. In steady flow, the free surface assumes a vanishing normal velocity component which may be in conflict with the non-vanishing tangential velocity component applied on the moving solid boundary. A possible remedy consists of replacing the non-vanishing velocity condition on the moving solid boundary by a slipping condition with a high coefficient in the slipping law and the required tangential velocity.