I am trying to simulate a FSAE Wing but even though the mesh seems perfect I am having some problemas in the post-results. The Velocity seems to go beyond 200 m/s even though the initial velocity is 15m/s. The air flow starts to acelerate ritgh in the beginning of the winf tunnel.
The link of the project is below.
Thank You for your help
Hi this is Fillia
The issue here seems to be mesh related - the rest of the settings are alright-.
These are my suggestions:
Use this vehicle tutorial as reference: Aerodynamic Flow Behavior Around a Vehicle Tutorial | SimScale
Reduce the Enclosure’s size - as in Figure 5 -, or even better, simulate half the model with Symmetry.
Switch to the Standard mesher and use refinements like in the vehicle tutorial. ( 2 region refinements and a local element size, the boundary layer is generated automatically).
Even if the layers are generated automatically, you can control their characteristics on the main mesh tab. Use this calculator: https://www.pointwise.com/yplus/index.html
You can always check the mesh quality using this guide:
Let me know what you think.
Thank you for the quick reply. I will try to generate this mesh but I can’t quite understand why my mesh is not working. The Y+ seems whithin range which means the problem is not the mesh near the wing but the mesh in the Bounding Box as Well.
I tried a new mesh with the simmetry condittion and the mesh seems to have a good quality, but i keep having the same problem with the velocity and pressure. The pressure around the wing does not match the velocity with the bernoullis laws. I don’t quite understand why the problem might be in the mesh if the boundary layer seems ok and the mesh quality test indicates no problem.
The project is below.
I believe the problem is with the difference between the mesh refinement within the cartesian boxes. I have a cartesian box with a refinement level of 7 and the outer one has one of 2. As you can see in the picture below, the problem of the velocity seems to originate right in the intersection of both.
I appreciate the help!
Hi there, I hope you had a lovely weekend!
Indeed, if there is a big difference between refinement levels, this could cause issues. Did you try a smoother transition between region refinements?