Hello EveningSkyPerson,
many thanks for attaching your Freecad-File (*.FCStd). I have checked your file, it took me some time, that is one of the reasons that my answer is so late. After checking your model, I can say that you have build your model according to my video, there are no significant deviations. With the original file that I used for my video, I get now the same results as you.
The answer from thschrader concerning the mesh is correct: There is an issue with the meshing with cfMesh. In my original video, meshing lasted 1:28 minutes, now it takes me only 0:33 Seconds. The reason for faster meshing is that the area under the car is not meshed.
First the mesh generated with V0.19, taken from my video at 24:00:
- Meshing with V019.JPG (71.07 KiB) Viewed 3405 times
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And here the mesh with V0.20:
- Meshing with V020.JPG (290.98 KiB) Viewed 3405 times
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I assume that this is an issue with cfMesh, I switched the mesher to gmesh, and all areas are meshed. For the video tutorial, I used cfMesh because cfMesh offers more options for MeshRefinement. If possible, I prefer gmesh because algorithms in gmesh are according to my experience more stable.
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The "check Mesh" function presented in the answer by thschrader is a new feature in V0.20 / CfdOF 1.21.0. In Version V0.19, this function was not available. The "check Mesh" is a very useful function. Thank you very much for showing.