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simpleFoam - setting the pref value

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Old   November 6, 2016, 07:38
Default simpleFoam - setting the pref value
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I have been running simpleFoam for flow analysis over a car and initially set pref = 101325 (in the fvSolution file) which was giving quite large forces when integrating the surface pressure over a car body.

I then changed pref=0 and re-ran the same case, giving significantly lower force values (and more realistic CL & CD), when integrating the surface pressure on vehicle.

Think it maybe be related to the surface pressure integration method in Paraview.

Last edited by ufocfd; November 6, 2016 at 15:55.
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Old   November 9, 2016, 14:34
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Mahdi Hosseinali
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When you're solving incompressible flow the absolute pressure is not important, it's just the gradient (even when integrating an immersed surface such as a car body). If your solutions are correct velocity profiles should be reasonable.
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prefcell/prefvalue, simplefoam

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