Dale,
thanks so much for checking the Moment data for me! I was also looking for this in your ORSI program but its great that you could add this so easily. I agree that i could run all of these sims longer, and the one running now is going until 1800 iterations. The problem is that i have quite a few to do and i dont want to use up that many core hours. I could however use the Y moment feature in the ORSI program. That would help verify the last important parameter for the front/rear downforce calculation.
However, this is why i put my results in this thread. If i can use the relaxation factors to speed up convergence then i wont have to run my sims so long. Is this actually true though?
I agree this question should be investigated, because the way i understand it as of now, higher values of under relaxation (0.5-0.1) allows the simulation to converge quickly but obtains results at a larger deviance from the “true” value. Like you said, results you want. Maybe not accurate but results nonetheless. Im thinking this would be good to use on bad meshes or on simulations where the results can be 5% off of the correct value.
Low values of under relaxation (0-0.5) are used to really hone in on the exact values that can be used to compare with experimental findings, maybe 1% or lower tolerance.
I basically see the relaxation factors as a Speed of results vs accuracy of results. This is not really that much different then any other factor that follows these same principles.
Good CAD accuracy to real life model = accurate results with long simulation time
OK CAD accuracy to real life model = ok results with shorter simulation time
Highly refined mesh to capture all surfaces perfectly = accurate results with long simulation time
Somewhat coarse mesh due to computational restrictions = ok results with shorter simulation time
I also agree that the auto relax needs to be explained to make me want to use it. The other automated settings i stay away from so that i can have control over the process.
Dan