dieselFoam: Volume fraction limitation?

Rachel · July 15, 2009, 04:32

Hello All,

I would like to ask if dieselFoam solver works for low volume fractions of injected liquid or is it more robust?
My case has a liquid inlet which has double the mass flow rate compared to gas. Will dieselFoam be able to handle this or do I have to do some modifications?

Thanks for your time,
Rachel

natrask · July 15, 2009, 10:37

Dieselfoam works under the assumption that the volume of the discrete phase is negligible in comparison to the gas phase. This is accurate to values of void fraction > about 0.9. After that you would expect to get flow separation around the injector, etc. We're working on incorporating a modified set of transport equations identical to Fluent's implementation of DDPM (you can check out their documentation for more information) that should make the code appropriate for lower volume fractions.

Rachel · July 20, 2009, 04:52

Thanks Nat

alberto · July 21, 2009, 02:09

Hi Nat,

do you plan to consider collisions in the DPDPM (a fancy name for the multiphase particle-in-cell method) as FLUENT does, namely with the introduction of an arbitrary stress tensor whose effect is to keep clouds from passing the imposed limit for the volume fraction too? Or do you plan to include the effect of collisions in some more refined way?

Best,

July 15, 2009, 04:32	dieselFoam: Volume fraction limitation?	#1
Rachel Member Rachel Vogl Join Date: Jun 2009 Posts: 48 Rep Power: 16	Hello All, I would like to ask if dieselFoam solver works for low volume fractions of injected liquid or is it more robust? My case has a liquid inlet which has double the mass flow rate compared to gas. Will dieselFoam be able to handle this or do I have to do some modifications? Thanks for your time, Rachel

July 21, 2009, 02:09		#4
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Hi Nat, do you plan to consider collisions in the DPDPM (a fancy name for the multiphase particle-in-cell method) as FLUENT does, namely with the introduction of an arbitrary stress tensor whose effect is to keep clouds from passing the imposed limit for the volume fraction too? Or do you plan to include the effect of collisions in some more refined way? Best, __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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July 15, 2009, 10:37		#2
natrask New Member Nat Trask Join Date: Mar 2009 Location: Providence, RI Posts: 18 Rep Power: 17	Dieselfoam works under the assumption that the volume of the discrete phase is negligible in comparison to the gas phase. This is accurate to values of void fraction > about 0.9. After that you would expect to get flow separation around the injector, etc. We're working on incorporating a modified set of transport equations identical to Fluent's implementation of DDPM (you can check out their documentation for more information) that should make the code appropriate for lower volume fractions.

July 20, 2009, 04:52		#3
Rachel Member Rachel Vogl Join Date: Jun 2009 Posts: 48 Rep Power: 16	Thanks Nat