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June 26, 2014, 07:47 |
Forces from simpleFoam
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#1 |
New Member
Sture Smidt
Join Date: Mar 2013
Posts: 27
Rep Power: 13 |
Hi,
This may have been covered before but: -What is the reference density used by simpleFoam? I am analyzing a sphere in air at 10 m/s, but the stagnation pressure is 20% off. This may indicate that the density is treated as unity (1.0). Are the simpleFoam results based on a density of unity? |
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June 26, 2014, 09:34 |
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#2 |
Senior Member
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Hi,
there's no density in simpleFoam cause equations are divided by constant density and you're using kinematic viscosity. Surely miss in stagnation pressure can mean error in simpleFoam, but it equally (actually more likely) can be the error in your case setup. |
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June 28, 2014, 18:00 |
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#3 |
Senior Member
Joachim Herb
Join Date: Sep 2010
Posts: 650
Rep Power: 21 |
Is your medium air (with density 1.2xx kg/m³)? In simpleFOAM the pressure used is p/rho, so this might explain the 20 % difference you see?
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August 7, 2014, 14:41 |
Forces from simpleFoam
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#4 |
New Member
Sture Smidt
Join Date: Mar 2013
Posts: 27
Rep Power: 13 |
How about forces from simpleFoam extracted with functionObjects? Are they normalized with the density like F=f/rho?
SS |
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