Hello! We have been running wind simulations using the butterfly plugin. We used the outdoor airflow example script with the following parameters:-
a) wind velocity of 3.1 m/s
b) Refinement Level - (1,1)
c) Refinement Mode – 3.0
d) Global Cells - 2000000000
e) No. of iterations in solution – 600
When we used Paraview to extract results we found that A unnatural bounding box (same as refinement region) has formed. The results read the refindment region as a obstrcution that obstructs windflow and effect of surrounding nrighbourhood buildings is not reflected. This result looks incorrect as wind does not flow in such a way.
We have tried running the script without a refinement region but we were not able to get proper mesh for the geometry.We have tried removing surrounding buildings to see if the results would change but remained the same.
Hi @Midori You shoud pose some screenshot of your model and the paraview results.
As I know, refinement region will decrease the wind speed inside it. I suggest you to use XYZ grading to get a bettter blockMeshing. And increase the refinement level to (2,3). You can refer to my previous post
Hi @minggangyin. Thank you for the reply. Here are some screenshots of the paraview results.
For further investigation, I ran the simulation with the same parameters as the previous run except without any surrounding buildings to check if the wind shadow caused the box to form and increased the number of iterations. I visualized the results in paraview and extracted the following images.
