4.7 Getting started - WindSim

Terrain
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Figure 4. Report of Terrain module: 2D Field, Elevation.
Click on the black arrows in the Report menu of commands to visualize 2D Fields: Elevation,
Roughness height (z 0 ) with both linear and logarithmic scale, inclination angle (deg), second
order derivative of the elevation and Delta elevation. The former variable, the delta elevation,
assumes a value different than zero only when the smoothing option is applied to the model.
Click on 3D Model and black arrows to visualize Grid (xy), Grid (z) and Open area. Grid (xy)
and Grid (z) contain information about the grid spacing and number of cells used for the
discretization in horizontal and vertical directions. The Open area data is a useful tool to
understand if too much blockage has been introduced in the generation of the 3D model, a
Wind Field simulation can be viewed as a numerical wind tunnel test, too much blockage
would produce unacceptable speed-up. The ratio between minimum and maximum open
area is used in the automatic generation of the proper height of the 3D model.