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Multiphase air and exhaust gas mixture

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Old   September 23, 2011, 03:56
Default Multiphase air and exhaust gas mixture
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Hamza Motiwala
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hey everyone,

I am trying to simulate a high pressure exhaust gas recirculation system. I need to define multiphase flow here. The main inlet would be air and the ╔GR inlet would have exhaust gas. I checked the available materials for the multiphase model in starccm and could not find anything that would resemble exhaust gas. I am using unsteady segregated flow model along with turbulence and eulerian multiphase.

Can anyone help me in some way define exhaust gases for this model? Any help would be appreciated.

Thanks,
Hamza
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Old   September 23, 2011, 08:24
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Robert
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What you need to define is a multi component problem not a multi phase one. All the components are gases. You define the various gases needed then specify their concentration at the various inlets.
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Old   September 26, 2011, 08:16
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Hamza Motiwala
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Thanks Robert! I will try that out and let you know.
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Old   September 27, 2011, 07:43
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Hamza Motiwala
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Hello Robert,

I tried using the multi-component gas model and I was not able to give in the exact proportions of the components. I also just want to specify this mixture for EGR inlet and I want air for the main inlet. I could not find a way to do this either.

One thing I found is that I can define a different continuum for both the gases but I dont think it will mix anything and it might not even work if I define the egr as a different region.

Do you know any other work around for this problem?

Thanks,
Hamza
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Old   September 27, 2011, 16:11
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Why could you not specify the components? You build a multi component gas mixture in the physics. At each inlet you can specify the mass fraction of each component.

What more do you need to specify?
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Old   September 28, 2011, 05:38
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Hamza Motiwala
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Hey Robert,

Thanks. I completelty overlooked the mass fraction thing and it was by default set on constant. Anyways I fixed it and am running the simulation now. Hope for some good results.

Thanks again,
Hamza
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