Answer:
RWIND Simulation uses a numerical CFD model (Computational Fluid Dynamics) to simulate wind flows around objects using a digital wind tunnel.
RWIND Simulation is designed to use a variety of numerical solvers. We currently recommend using the OpenFOAM® software package, which has provided very good results in our tests and is also a frequently used tool for CFD simulations.
The numerical solver is called "RWINDSimulationSolver" and it belongs to the SIMPLE solver family. It is a solution for incompressible turbulent flow at steady state using the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithms.