This is my first simulation using SimScale. I’ve followed the tutorials, but I am getting 2 erros. I can’t run the simulation because of them. The errors are:
Wall 6 has face assignments that do not belong to a volume region
and
A setup with 8 regions is being used in a single-region analysis type. Please make sure that all regions except for one have an Advanced Concept assigned to them.
In short, the volumes should be watertight & solid for simulations. As I can tell, the underfloor of your car consists of a simple sheet, so that’s causing issues. I’d recommend going back to your cad model and adding some thickness to the part.
The second problem is related to the enclosure operation. For Incompressible analysis, we need a single volume to run simulations (the flow region). The other solid parts should be removed from the geometry, otherwise they will cause a multi-region mesh error, which is the error that you ran into.
To solve this, please toggle off this option in the enclosure operation:
I’d recommend that you have a look at our external aerodynamics tutorial around a car, which will give you a good idea of the setup of this simulation.