density calculation in reactingMultiphaseEulerFoam

mike.franky · May 5, 2016, 09:27

Hi,

I am using the reactingMultiphaseEulerFoam to simulate the solution and dissolution of gases in a liquid. I am really struggling to understand how OpenFoam calculates the density for each phase. For the liquid phase I am using perfectFluid equations of state where I give a reference density. However, for the gaseous phase I am using the perfectGas equation of state which does not ask for the density (I am using heRhoThermo for both the liquid and gas). Can someone help me understand how the density is calculated?

Thanks in advance for any help.

Cheers
Mike

demichie · May 6, 2016, 13:17

For perfect gases rho=psi*P, where psi is the compressibility.
psi= 1/(RT), where R is the gas constant, function of the molecular weight and the universal gas constant.

mike.franky · May 9, 2016, 04:57

Hi demichie. Thanks for your response. It was very useful.

May 5, 2016, 09:27	density calculation in reactingMultiphaseEulerFoam	#1
mike.franky Member Michael Frank Join Date: Aug 2012 Posts: 55 Rep Power: 13	Hi, I am using the reactingMultiphaseEulerFoam to simulate the solution and dissolution of gases in a liquid. I am really struggling to understand how OpenFoam calculates the density for each phase. For the liquid phase I am using perfectFluid equations of state where I give a reference density. However, for the gaseous phase I am using the perfectGas equation of state which does not ask for the density (I am using heRhoThermo for both the liquid and gas). Can someone help me understand how the density is calculated? Thanks in advance for any help. Cheers Mike

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May 6, 2016, 13:17		#2
demichie Member Mattia de\' Michieli Vitturi Join Date: Mar 2009 Posts: 50 Rep Power: 17	For perfect gases rho=psi*P, where psi is the compressibility. psi= 1/(RT), where R is the gas constant, function of the molecular weight and the universal gas constant.

May 9, 2016, 04:57		#3
mike.franky Member Michael Frank Join Date: Aug 2012 Posts: 55 Rep Power: 13	Hi demichie. Thanks for your response. It was very useful.