[Stefano Segneri]

Good morning everyone.

I am studying the 2D turbulent flow over a car with SU2. To do that I have created some hybrid meshes with Gmsh. The problem is that if I decrease the elements size beyond a certain threshold the simulation diverges. I have tried two different meshes, the second has a refinement box all around the car and it diverges with a lower number of elements than the first. Does anyone know the reason?

You can find attached the geo files of the mesh.

Thanks in advance.