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Bug in 1.5-dev buoyantFoam - static pressure

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Old   March 16, 2010, 19:39
Default Bug in 1.5-dev buoyantFoam - static pressure
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David Gaden
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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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Old   March 17, 2010, 11:13
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David Gaden
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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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