Recently I came across an accurate modle of a Porsche 944 and I desided to do a CFD analysis in order to calculate the Cd and Cl. Now I ran the simulation and got a 45% error on ther Cd (0.33 Claimed, 0.5 Measured). I relize that it wont be perfect because the model isn't 100% accurate, however, I would happy with at least a 10% error.
During the simulation i set the initial air velocity to 160 km/h however, when the simulation finished the air velocity was 136 km/h. I dont understant how this happens because I set the velocity as a constant.
From what I have read so far the mesh is KEY to have accurate results. So basically I need help setting up my mesh.
|Curvature Refinement Level||4|
|Tolerence Refinement Level||3|
|Refine Fluid Cells||2|
|Refine Partial Cells||4|
|Refine All Cells||-|
|Narrow Channels Refinement Level||1|
|Initial Mesh Level||7|
If you need any more information just let me. I can also provide the actul CAD model and pictures if needed.
I would greatly appreciate any information you guys can provide and thanks in advance.