When reviewing similar studies, I noticed that they commonly use a 'velocity inlet' boundary condition, indicating they did not use 'Open Channel Flow.' Additionally, they set the upper boundary condition as 'pressure outlet,' whereas I have it set as 'symmetry.' When I attempted to replicate their setup, I encountered a 'reverse flow at pressure outlet' error. Extending the distance of the 'pressure outlet' did not resolve the issue. I also tried combining the 'pressure outlet' with 'Open Channel Flow,' but the error persisted. I don't believe the distance of the pressure outlet is the cause, as no errors occur when I set the upper boundary to 'symmetry.' I should contibue with "Oepn channel Flow" or I should close it and continue with "velocity inlet" BC ?
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