Link to project: https://www.simscale.com/projects/mario44/modele23_414_630878999/
We’ve been running simulations of our FS car without issue for over a year with mostly the same meshing setup, with minor tweaks when introducing alterations (such as additional refinements in that area). Our mesh has had around 14-15 million cells consistently, with usually around 300ish cells not falling into the recommended non-ortogonality range of below 88 degrees (which never affected the convergence of the simulation). However, 2 weeks ago, this meshing setup has out of the blue become of very bad quality (edge, aspect and volume ratios of over 50 000) and all of these problematic cells are located on the xy plane (where the moving wall boundary condition is located to simulate the relative movement of the road while driving the vehicle). Most of these bad cells aren’t even visible in Mesh Inspection. All of these meshing issues have caused the divergence of all solvers when trying to run the simulation. Any info on whether there has been any updates in the software and which steps we can take to solve these issues would be very welcomed. Thank you in advance!!
Hi @andjela555,
Thank you for your detailed post and for sharing your project with us. I’ve looked into whether any recent platform updates might be the cause, but I couldn’t find any information about changes that would explain this behavior. This suggests the issue might be related to the specific setup of your project.
Given that the problematic cells are concentrated on the xy plane where your moving wall boundary condition is, I recommend focusing your troubleshooting efforts there. Here are a few steps you can take to address this:
- Geometry Check: Carefully inspect the car’s underbody and the ground plane for any small faces, sharp angles, or other geometric imperfections that could be causing the mesher to generate poor-quality cells.
- Tire-to-floor connection: meshing issues are frequently observed in tight spaces, like the one between the car and the road. If such gap exists, make sure to remove it by adding a flat “step” to the tire or movign it farther away from the ground.
- Tutorial: You may also find this tutorial on the aerodynamics of a race car helpful. It covers the entire workflow for this type of simulation, from geometry preparation to post-processing, and includes best practices for meshing that you might find useful.
Please give these suggestions a try and let us know how you get on. We’re here to help you get your simulations back on track.
Cheers
Igor