4.7 Getting started - WindSim

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Wind Fields 19 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 <strong>WindSim</strong>: • A segregated solver (SIMPLEST) • An algebraic coupled multi-grid solver (MIGAL)
20 <strong>WindSim</strong> AS Select the Wind Fields module and run the module with default settings. A window pops up to let the user follow the development of the flow field during the iterative computation. By default the software monitors the 3D magnitude of the velocity vector at the ground level (ground adjacent cells). If the simulations have reached a converged solution, you should not be able to see any further change in the contours plots monitoring the computational history. In the Report you can check whether the modelling has been carried out correctly by inspecting the graphs of the Spot and Residual values for all the solved variables, Figure 11 and Figure 12. Figure 11. Wind Fields > Report > Spot Values.
Page 1 and 2: 4.7 Getting started 30.04.2007 Wind
Page 3 and 4: 2 WindSim AS WindSim 4.7.0, demo ve
Page 5 and 6: 4 WindSim AS Explanation of control
Page 7 and 8: 6 WindSim AS Modules Here you can s
Page 9 and 10: 8 WindSim AS Once you have calculat
Page 11 and 12: 10 WindSim AS Property information
Page 13 and 14: 12 WindSim AS Terrain The first ste
Page 15 and 16: 14 WindSim AS When you click on 3D,
Page 17 and 18: 16 WindSim AS and maximum area of t
Page 19: 18 WindSim AS Figure 9. Terrain > R
Page 23 and 24: 22 WindSim AS Figure 13. Wind Field
Page 25 and 26: 24 WindSim AS Figure 15. Objects >
Page 27 and 28: 26 WindSim AS Figure 17. Perspectiv
Page 29 and 30: 28 WindSim AS Figure 18. Properties
Page 31 and 32: 30 WindSim AS Figure 20. Results >
Page 33 and 34: 32 WindSim AS Figure 22. Wind Resou
Page 35 and 36: 34 WindSim AS Figure 24. Wake defic
Page 37 and 38: 36 WindSim AS Figure 26. Wake defic
Page 39 and 40: 38 WindSim AS Figure 29. Report pan
Page 41: 40 WindSim AS Figure 34. Energy > R

4.7 Getting started - WindSim

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