Hi @alijalil,
For different flow angles, you need to do the following:
For changing the wind direction from Front to Rear, you need to rotate your geometry by 180 degree (as an example) . That rotation should be done in your CAD program. You need to import again the geometry into SimScale and recreate the mesh and simulation .
For intermediate angles, you would need to do the same: import rotated geometry and redo the simulation.
Mind that you can make a copy your previous simulation into new one and then select different geometry.
Take care,
Retsam