This video shows the implementation of an OpenFOAM model for the case of fish passage. It uses interFoam to solve the free surface, and a Delayed Eddy Simulation treatment to solve the turbulence, using the kOmegaSSTDDES model. The model has a couple of interesting features, that apply to other cases: - A fixed water level boundary condition in the downstream boundary, which is achieved by fixing the pressure (p_rgh) in all the wet faces. - The air velocities attenuation technique explained in this repository: The source code for the cases can be found in the following repository: #cfd #mesh #OpenFOAM #grid #numericalmodeling #computationalhydraulics #mechanicalengineering #mechanical #research #simulation #cae #fluiddynamics #fluidmechanics #turbulence #aerodynamics #automative #aerospace #flow #motorsport #openfoam #ansys #starccm #opensource #technology