I realized a simulation of a free surface flow in the presence of periodic roughness with the VOF model. I remarked that when we impose the pressure gradient for the entire domain, the velocity of the air phase will be 100 x the velocity of the water phase.

Is it for this reason Fluent says that the periodic condition is not compatible with VOF?

To avoid this problem I used a UDF to impose this pressure gradient only in the water phase and I solved the problem.

Is the procedure I followed is logical?

How to contact Fluent for this problem?

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