I am trying to perform an incompressible fluid simulation to a car model.I’m using the hex dominant parametric to create the meshes because I saw in this forum that this is the most suitable for my simulation.My problem is that my drag coefficient is diverging.Im not really sure why,I think the mesh…

Hello, To be fair, the main issue here is definitely the mesh. The mesh quality looks very poor (both from a visual check and also from the meshing log): [image] Generally speaking (especially if you are new to CFD), I would recommend using the standard meshing tool instead, which will be much e…

Hey Rian, I would start by checking the boundary layer mesh sizes and the y+ values, according to the desired wall modeling: [image] How to Control and Analyze Y+ in Meshing and Simulation | SimScale How to control, observe, and analyze y+ during the meshing, simulation, and post-proce…

Hi ggiraldof,thank you for the response.I just want to ask if I need to rerun my simulation again so that I can check my y+?

Hey there, you indeed have to add the ‘Turbulence’ under the Field calculation prior to the run so you can check the y+ in the post-processor. [y+]

I already saw the problem,the surface tangent to the wheels of my car has a y+ exceeding 300 [Screenshot (951)] What should I do now? Do I need to add layer refinement on that surface?

Thank you! This article really helps me :slight_smile:

Thanks RicardoParis,I thought that the values for bounding box resoultion is completely arbitrary and putting any values is fine as long as I refine the mesh near the car but it doesnt really work that way.I want to use the standard mesher for my simulation but I saw a post in a forum that, it is no…

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Diverged result on incompressible fluid simulation of a car

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riangarcia306 May 13, 2021, 5:25pm 7

I try to add a bounding box layer to refine the surface but this happens