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January 31, 2012, 08:53 |
Ideal Gas Mixture, non reacting
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#1 |
New Member
Francesco Borgosano
Join Date: Dec 2011
Location: Heidelberg
Posts: 17
Rep Power: 14 |
Dear all,
I'm a newbie in OOP programming and numerical modelling. I'm trying to simulate a gas mixture flowing in a complex 3D geometry, but I don't know how to write my thermophysical model. I tried to learn something from the forum but I didn't find a clear response. I have a gas mixture of: 90% Helium, 9% N2 and 1% Xenon. I would like to use the ideal gas law to calculate rho during the numerical simulation. I thought something like: Code:
thermoType thermoModel<pureMixture<constTransport<specieTermo<hConstTermo<perfectGass>>>>>; Thanks in advance |
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February 1, 2012, 06:19 |
ThermophysicalProperties
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#2 |
New Member
Francesco Borgosano
Join Date: Dec 2011
Location: Heidelberg
Posts: 17
Rep Power: 14 |
About my previous question,
I send you in attachment my ThermophysicalProperties file. I guess should be right, but my doubt is that in this way I have an homogeneous mixture. And this is not what I want, because I have inhomogenoeus mix. Where can I define my rho... something like rho=0.9*rho_He+0.09*rho_N2+0.01*rho_Xe, or maybe define the partial pressure? I look forward to hearing you |
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February 2, 2012, 08:55 |
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#3 |
Senior Member
Markus Rehm
Join Date: Mar 2009
Location: Erlangen (Germany)
Posts: 184
Rep Power: 17 |
Hello
have a look at the combustion examples there you will find how to define mass or volume fractions. Markus |
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March 19, 2013, 12:49 |
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#4 |
New Member
Georg Brösigke
Join Date: Nov 2012
Posts: 6
Rep Power: 13 |
Dear Foamers,
I have a similar problem in finding a thermophysical model for the simulation of an inert mixture of gases. All I want is to use temperature dependent thermophysical properties of a gas mixture where I can arbitrarily define its composition. I am so far as to believe that this must be either trivial or very hard, because all I can find concerning this topic are threads like this, where the answer is rather unsatisfying. Do I understand correctly that the pureMixture model is not capable of treating mixtures the way I want? Looking at the combustion tutorials did not help me very much to be honest, because those are dealing with chemical reactions - or is it a common workaround to use those models without chemical reaction? thanks in advance, best regards Georg |
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April 12, 2013, 07:52 |
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#5 |
Member
Join Date: Nov 2012
Posts: 83
Rep Power: 13 |
im working on a simliar problem i need a mixture of different gases. But the puremixture is not supporting that.
Im trying now to implement the combustionthermodynamics in rhoCentralFoam. has anyone experience with that? |
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April 12, 2013, 08:10 |
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#6 |
Senior Member
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 27 |
i also want to model a compound of gases without reaction.as well as question that propounded i have a question that
Which combination should i choose for gases coming out from a typical gas turbine combustion chamber? I want to analyze this compound to another device without any combustion or reaction. |
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Tags |
3d flow, gas mixture, thermophysical model |
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