2.3.3. 3D Numerical Model

The 3D river flow simulation model RSim-3D [73] was used for this comparative study. The spatial discretization in this software is provided by applying an unstructured computation grid consisting of polyhedral cells. Employing a generalized finite volume method, the Reynolds equations are approximated numerically. The SIMPLE method provides coupling of pressure and velocity fields, the standard k-ε model is implemented for turbulence closure, and the determination of the water surface elevation is achieved by evaluating the computed pressure at the water surface.
