I am comparing results from Butterfly with those from Autodesk CFD. I created a simple urban wind model and ran both simulations with a base wind speed of 5 m/s. The buildings range in height from 10-20m. The results are displayed on a 3x3m grid, with a coloured mesh showing wind speed and white arrows showing direction.
The wind patterns seem quite similar, but there is an obvious difference in wind speed between the two simulations. I’ve inspected the meshes and they both are of good quality. Does anybody have any ideas about the difference in behaviour? It seems strange that the Butterfly results show such a low wind speed at the entrance of the tunnel (around 2 m/s), shouldn’t this be 5 m/s?
Any help would be much appreciated!! Let me know if you need more details