I’m trying to create a curved bounding box so as to simulate a car taking a turn. I tried making a bounding box on my cad software and then using it but the simulation failed, is there any option to make a bounding box similar to a toroid or torus?

Try using the extract fluid volume on a CAD file that has your curved bounding box on it and then do an internal simulation with it… But I do not think you will like the results you get by trying to ‘curve’ your flow…

Hi @markII ! That’s possible, meaning the simulation of “cornering” not the creation of a curved bounding box! Let me give you some resources for that: Cornering Flow Case of a racecar on SimScale MRF Zone Definition - FSAE Model - #11 by pfernandez Cornering Aerodynamics - FSAE - #4 by Dal…

[image] jousefm: not the creation of a curved bounding box I used that term loosely here… with internal fluid extractions, the outside wall is a ‘sortof’ bounding box that can be any shape you want :wink:

Same here, I should have mentioned that you can of course create an arbitrary shape for your bounding box but not on the platform, so you would have to choose a CAD software tool of your choice @markII ! :wink: Hope we could help you a bit! Jousef

[image] DaleKramer: be any shape you want But NOT if you plan to use HEX parametric meshing algorithm (SimScale, please allow internal meshing with HEX parametric meshes :pray: )

Well, I use HEX parametric for Internal CFD. The project (I shared with you and Ric) is https://www.simscale.com/workbench/?pid=6414850718207970462&mi=spec%3Add5e8f5e-7f49-42ad-a61a-7cf083178f8e%2Cservice%3ASIMULATION%2Cstrategy%3A56 Simulation: CylinderSlice_HEX+MRF Cheers, Retsam

WOW, I stand corrected then, my memory is old on that one, thanks…

WOW, great trick I just learned from you Retsam… I have to put a Background Mesh Box around/through my geometry and then select geometry faces for inlet,outlet,‘tunnel’ walls… :trophy: Darn, I wish I would have thought of that :thinking: EDIT: But wait, I did do that in my problem mesh above… @Re…

I do not know what went wrong: For Internal CFD, I create my own BMB of any shape. It does contain a ‘negative’ of all geometries to simulate. So, If you assign the BC to that BMB, there is no problem. All internal geometry should be available for detailed BC definitions…

SimScale CAE Forum

Yaw Simulation for a fsae car

Using SimScale Fluid Flow / CFD

DaleKramer January 13, 2020, 12:50pm 9

Maybe you can help with the mesh attempt at this Oct 2019 post where I try to do it?