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March 16, 2010, 17:39 |
Bug in 1.5-dev buoyantFoam - static pressure
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#1 |
Senior Member
David Gaden
Join Date: Apr 2009
Location: Winnipeg, Canada
Posts: 437
Rep Power: 22 |
Correct me if I'm wrong, but:
Should be: p_static = rho_ref * g * h The code uses: p_static = rho_local * g * h This assumes that rho_local is the same all the way up the fluid column, which it is not. A fluid element with low density (locally) will have an erroneously low p_static. A reference density really is needed. |
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March 17, 2010, 09:13 |
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#2 |
Senior Member
David Gaden
Join Date: Apr 2009
Location: Winnipeg, Canada
Posts: 437
Rep Power: 22 |
Strike my last.
The hydrostatic pressure definition is different in buoyantFoam. I didn't realize how the buoyancy momentum source related to the way hydrostatic pressure is defined. In general: Sm = grad( p_hyd ) + rho g |
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