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[FAQ]

A 2D flow case involves free surface and surface tension, where contact angle is imposed at the exit of the computational domain as well as a draw-down (take up) velocity. The solution exhibits a sudden change of slope at the exit. This may originate from the selected velocity boundary conditions at the exit of the computational domain. The trouble is likely to happen when both velocity components are imposed at the exit. We suggest to replace this condition by a vn-fs condition. Sometimes however, it does not really work as it may affect the flow stability. A remedy would consist of selecting vanishing tangential and normal force components and imposing the normal velocity and tangential force component through a mechanism of submodel. Whenever possible, cartesian components should be selected for assigning the submodel.