CFD Simulation FSAE Car - Simulation Error at 0%

[yosukegb4]

Hi @DaleKramer

I have tried making volume meshes (snappyHexMesh) from STEP/IGES/Rhinoceros geometry files on SimScale in my projects, but the mesher made wrong meshes like shown below.

Even for a project other than mine when using CAD files such as STEP data, meshes were not created in the intended shape in some cases like in the issue of the link below.

Hex mesh ignoring faces

Hi all, I was curious about some of the Concorde’s delta wing vortex lift characteristics and decided to model it. I got a great cad file off grab cad and proceeded to de-feature it. It took a lot of de-featuring but eventually sim scale reads nothing too faulty on geometry import other than a vertex warning which I get with most of my projects. The issue came during meshing, it appears that hex mesh is ignoring some faces of my model, namely the faces of the fuselage, and replaces them with s…

Hex mesh ignoring faces

Hi everyone! In my experience, this meshing problem occurs when converting a strongly curved surfece (like cylinder) to STL mesh. On the other hand, CAD files like STP and IGES did not work well on SimScale CFD meshing for my projects. So I use STL files for CFD meshing that exported from CAD with adjusting parameters. I often adjust the parameters as below when this kind of problem occurs. Maximum edge length : smaller Maximum distance, edge to surface : smaller ( I use Rhinoceros for su…

These problems were solved by using the STL files for geometries.

( I don’t know the mesh creation algorithms well, but I think that some surface meshes like STL are created and used when creating volume meshes. It seems that the surface data of STEP/IGES/Rhinoceros is not directly used when creating volume meshes. Could you someone explain the right thing about the algorithm of creating meshes, please? )

Anyway, when STEP/IGES/Rhinoceros CAD files are used for geometry data, sometimes there are some surface processes that I can not control (or just I do not know settings for) the surface accuracy.
But the accuracy of STL meshes can be controlled when exporting from Rhinoceros and It can be reflected in volume meshing creation well.

These are just only my narrow experiences, but these are why I feel “stable” using STL.

Regards,
Yosuke