What is computational fluid dynamics? These simulations are performed as a virtual wind tunnel analysis (e.g. for shape optimization or tracing wind-borne projectiles) or for identification of boundary conditions for thermal analysis.
Example: The still picture published above shows wind velocity vectors on a high-rise facade. This analysis served to verify whether hundreds of glass scratches observed on the fenestration were caused by a certain wind event. Kaz found that the peculiar shape of the tower allowed air movement only in certain directions, regardless of the direction the wind was blowing. Therefore, many of the observed scratches could not possibly be caused by any wind-borne object rubbing against the glass.
As in any other transient simulation, the ultimate result is a video file, like the sample video showing wind washing analysis done on a single family residential house below:
[youtube]http://youtu.be/ycxBZ2-yu9w[/youtube] (credit Solidworks)
It shows the analysis of trajectories of wind-borne particles blowing from the pre-defined direction. The colors indicate the wind velocity next to the facade surface. It’s interesting to see how long the particles “dance” trapped in the vortex behind the house. The wind pressure can be also visualized, helping in facade design for structural resistance.