Please check the model in your CAD, and clean it for interferences and small faces. Also, I can see parts intersecting each other, which can also cause problems. Please also fix those cases, for example:
I had a look at your case and here are some pointers:
As my colleague @ggiraldof mentioned, the struts connecting wheels and the body are not modeled to touch each other. You can extend the struts and then do a boolean → union to merge them.
For an external Aerodynamics simulation we would need to create an enclosure around the body of the car to imitate the wind tunnel setup. This can be done within SimScale’s CAD mode and choosing the External Fluid volume operation. Here is an article that shows the workflow: How to Create Flow Volume Extraction? | Knowledge Base | SimScale
Hi @ananthu_ajit
In the last mesh I tried to generate, I think I have corrected all the problems caused by the CAD, but if you can confirm this, I would be grateful.
Secondly, we have already done a lot of aerodynamic simulations without the external fluid volume operation and all simulations were successful. I don’t really understand the point of this tool, can you tell me more?
Thank you very much for all your answers
Johan
I see that you are using the “Hex-Parametric” mesh to create the background box. This looks valid without an External Fluid volume. But is prone to errors often. The latest CAD geometry has all the parts modeled as Sheets and this might cause the mesh to fail. I would recommend looking into the CAD and check if you can convert them into solids before importing.
The previous model ( T21_30_30_R0_4) looks ok with Solids, except One part where many solids are put together and has a few edges interfering with each other.
