WindSim is a tailor-made simulator for prediction of local wind fields and dispersion of air pollution. WindSim is based on a 3D Reynolds Averaged Navier Stokes solver. Solving the non-linear transport equations for mass, momentum and energy makes WindSim a suitable tool for simulations in both complex terrain, and in situations with complex local climatology.

Assessment of wind conditions is accomplished with both experimental and numerical means. Typically, experimental data from a limited area is used in a numerical model to assess the wind conditions within a larger area. The numerical model calculates the terrain-induced acceleration of the wind field, the so-called speed-up.

WindSim - How does it work?

Local wind fields are highly influenced by local topography. The input basis for WindSim consists of a digital terrain model on a proper length scale, according to the phenomenon under consideration. WindSim can be used in a variety of length scales ranging from detailed micro siting up to larger meso scale modelling. WindSim uses so called body fitted co-ordinates (BFC) with refinement towards the ground.

In addition to the digital terrain model, a similar model with terrain roughness must be supplied. The terrain roughness has a particular impact in a zone towards the ground.

Finally, WindSim needs meteorological data from at least one point within the modelled area. With these primary inputs the wind conditions for the whole area can be calculated, detailed conditions around infrastructure can be obtained, and the area with infrastructure can be visualized in the 3D interactive visualization module.

The WindSim input format for the digital terrain model and the meteorological data can be obtained on request. However, WindSim contain utilities that can handle a wide range of existing formats.