Hello everyone! I’m doing a half car simulation for my school’s FSAE team but am seeing some strange results regarding the boundary layer refinement. Last year’s simulations ran with the same surface refinements that we’re using this year, with five layers on “Inflate boundary layer”. This year, we ran a simulation without our undertray with five layers as well and got reasonable results in post processing. We added our undertray to the model and have had to turn down the inflate boundary layer to three levels to get the model to mesh without crashing. Firstly, does it seem reasonable that the cell count was increased so drastically by adding our undertray that we have to turn down that boundary layer by 2 levels? We’ve had to upload the file as an STP since STL files give us errors with our cell zones. Secondly, the post processing looks completely different with different steam line trajectories, pressure distribution, etc… all having just changed that boundary layer. Any thoughts on why our results have changed this drastically?
Simulation with 3 layers
Simulation with 5 layers