4.7 Getting started - WindSim

Wind Fields
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Figure 10. Terrain > Report > 3D Model: Open area.
Wind Fields
Once the generation of the 3D model has been completed in the Terrain module, the CFD
simulations of the wind fields can start. The wind fields are determined by solving the
Reynolds Averaged Navier-Stokes equations (RANS), accounting for the continuity and
momentum equations time or Reynolds averaged. The standard k-epsilon model is applied
as turbulence closure. Since the equations are non-linear, the solution procedure is iterative.
The RANS equations are discretized and integrated with a finite-volume methodology.
Starting with the initial conditions, which are guessed estimations, the solution is
progressively resolved by iteration until a converged solution is achieved. Two possible ways
to solve the RANS equations are available in WindSim:
• A segregated solver (SIMPLEST)
• An algebraic coupled multi-grid solver (MIGAL)