My problem is that for example for these 3 simulations, the cavity behind the object has the same dimensions but the Reynolds number at the inlet is different from one to another ( 1e5, 2,5e5, 1e6), I'm also confused about my BC's because I'm trying to use "free surface" boundary conditions at the top patch ( p = 0, Slip bc's, etc) but I'm not interested in the interaction water - air ( I'm trying to avoid Multiphase simulation), ¿What can be wrong with my set up? ¿Is my approach bad?