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Hi, I'm working with a 3D model for flow only simulation with FEMWATER. I have fixed head bc on a side and transient head bc on the opposite side; saturated conditions in all the field. The change in head of the boundary condition doesn't affect the flow in the rest of the model; it seems that the boundary is not connected to the rest of the model! The compressibility of the water is put to zero, then the change in head have to be instantaneously transmitted to the model. The steady flow simulation works well. Did this problem occurred to anyone? Thank you for your attention