The velocity contour is shown below with a freestream velocity (U∞) of 10 m/s. I am uncertain about how to define the reference pressure location. Additionally, when I change the upper boundary condition from "Symmetry" to "Pressure Outlet," the free surface starts to deform, but I encounter a "Reverse Flow" error. Interestingly, the reverse flow appears near the inlet and at the uppermost part of the domain (i.e., along the upper boundary). The shape and position of the reverse flow change as I adjust the reference pressure location. Still, I use "Open Channel Flow" so I have "Pressure Inlet" BC. I should use "Open channel flow" for my problem or I should use velocity inlet BC ?
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