mass fractions to mol fractions

arun · May 18, 2011, 11:21

Hi All,

I simulating combustion simulation using dieselEngineFoam, and I would like to get the output of mol fractions of pollutants such as CO, CO2, HC, NO at every CAD. Currently I manage to get the mass of the species at every CAD.

E.g.
COAv << runTime.theta() << " " << fvc::domainIntegrate(composition.Y("CO")*rho).valu e() << endl;

Anyone can got any suggestion on how can I get the mol fractions?
Thanks in advance.

Regards
A

adhiraj · May 18, 2011, 16:48

I use OpenFOAM 1.7.1. As far as I see, you need to do the conversion yourself--possibly as a post processing step.

valikiut · December 29, 2011, 15:58

hello foamer

I want to simulate dual fuel diesel engine with OpenFOAM. Do I simulate this with dieselEngineFoam? If not, which solver I must use?
If I can use dieselEngineFoam, can I use (CH4) mass fraction in initial condition such as O2 and N2?
I want to calculate heat release rate (j/s), but in dieselEngineFoam output, dimension of dQ is (kg/(m^3*s)). How can I calculate heat release rate (j/s)? Do I have to change code?
Thanks.
Best Regards,
Divrakhsh

May 18, 2011, 11:21	mass fractions to mol fractions	#1
arun New Member Arun Join Date: Mar 2009 Posts: 25 Rep Power: 17	Hi All, I simulating combustion simulation using dieselEngineFoam, and I would like to get the output of mol fractions of pollutants such as CO, CO2, HC, NO at every CAD. Currently I manage to get the mass of the species at every CAD. E.g. COAv << runTime.theta() << " " << fvc::domainIntegrate(composition.Y("CO")*rho).valu e() << endl; Anyone can got any suggestion on how can I get the mol fractions? Thanks in advance. Regards A

May 18, 2011, 16:48	Mass to mole fractions	#2
adhiraj Senior Member Adhiraj Join Date: Sep 2010 Location: Karnataka, India Posts: 187 Rep Power: 16	I use OpenFOAM 1.7.1. As far as I see, you need to do the conversion yourself--possibly as a post processing step.

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December 29, 2011, 15:58		#3
valikiut New Member saeed divrakhsh Join Date: Jul 2010 Posts: 8 Rep Power: 16	hello foamer I want to simulate dual fuel diesel engine with OpenFOAM. Do I simulate this with dieselEngineFoam? If not, which solver I must use? If I can use dieselEngineFoam, can I use (CH4) mass fraction in initial condition such as O2 and N2? I want to calculate heat release rate (j/s), but in dieselEngineFoam output, dimension of dQ is (kg/(m^3*s)). How can I calculate heat release rate (j/s)? Do I have to change code? Thanks. Best Regards, Divrakhsh