i am really new into this stuff. I am working on incompressible flow around a car. Till now I scanned a car with a 3D Scanner and used different methods to construct a mesh ( alphashape, poisson, screnned poisson …). Now i wanted to use this meshes in .stl format to compute with simscale the drag coefficient of the car model. I am following the steps of " Tutorial: Incompressible Flow around a Formula Student Car" but with the difference i want to simulate for whole car an not one half. After setting the parameter i want to generate the mesh. But i am getting this error : “A setup with at least 3 regions is being used in a single-region analysis type. Please delete CAD regions that are irrelevant for the simulation. If all CAD regions are relevant, ensure that only one region is assigned to the material and that all other bodies are assigned to advanced concepts.” How can i handle this type of problem?
Hi @lurban, thanks for posting on the forum and welcome to the SimScale Community
Usually 3D Scanned models are usually not appropriate for simulation due to them containing undesired features/faces which will result in a faulty mesh. An additional problem is that they are exported as STL files, which often contains issues resultant from an unsuccessful facet splitting.
Since an additional problem was encountered, could you please share your project’s URL for us to take a closer look?
I’ve found your project in the list of the shared with support ones and have some further inputs here.
Since you’re running an Incompressible analysis, you can only have the fow region as a geometry in your model, since this solver doesn’t account for any interactions between solids and fluids. In this sense, you should delete these parts and the simulation will run (I don’t guarantee it will converge however!)
To better understand what I mean, take a look at the following tutorial, which seems similar to what you’re trying to achieve:
