OF pressure units???

sahmed · June 20, 2016, 14:18

Dear Foamers
I have a very fundamental question for which I need your suggestions. Does the pressure unit in OF always rho-normalized, I mean P/rho with the unit of
[0 2 - 2 0 0 0]?? For any kind of solver, if I want to apply, say atmospheric pressure, do I need to divide that with the rho to convert kg/m-s2 to m2/s2??

Any of your suggestion is highly appreciated.

sahmed · June 20, 2016, 15:38

Anybody please help me giving any of your suggestions on it.
Thanks in advance.

rapierrz · June 20, 2016, 15:45

Hi Ahmed,

Most of the solver in openfoam use p without division by rho,

but solvers in openFOAM/solvers/incompressible use of p/rho.

if you want, you can modify the solver and use of p with kg/ms2 dimension.

sahmed · June 20, 2016, 16:40

Thanks Hesam for the info. Do you know how to spit out 'rho' or 'viscosity' in OF? The value can tell about the unit.
Please reply any of your suggestions.
Thanks.

June 20, 2016, 14:18	OF pressure units???	#1
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Dear Foamers I have a very fundamental question for which I need your suggestions. Does the pressure unit in OF always rho-normalized, I mean P/rho with the unit of [0 2 - 2 0 0 0]?? For any kind of solver, if I want to apply, say atmospheric pressure, do I need to divide that with the rho to convert kg/m-s2 to m2/s2?? Any of your suggestion is highly appreciated.

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June 20, 2016, 15:38		#2
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Anybody please help me giving any of your suggestions on it. Thanks in advance.

June 20, 2016, 15:45		#3
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	Hi Ahmed, Most of the solver in openfoam use p without division by rho, but solvers in openFOAM/solvers/incompressible use of p/rho. if you want, you can modify the solver and use of p with kg/ms2 dimension.

June 20, 2016, 16:40		#4
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Thanks Hesam for the info. Do you know how to spit out 'rho' or 'viscosity' in OF? The value can tell about the unit. Please reply any of your suggestions. Thanks.