Species Specific Fields

hyperion · July 14, 2010, 15:06

Hi Foamers - Does anyone know if there is a utility or other method that would allow me to view results for individual species? Specifically, I would like to know velocity and density profiles for different species in a flow.

Also, does anyone know if there is a utility that outputs local Knudsen and Courant numbers (on a cell by cell basis)?

Thanks for any and all help.

hk318i · July 15, 2010, 06:26

Dear hypersion,

if you are modeling single phase flow, it is impossible to calculate the velocity and density of each species. To do that you should use the a momentum equation for each specie.
I think you are modeling something special not just single phase flow because you are asking about Knudsen number. It will be better to give a brief about your case.
Regards,
Hassan

hyperion · July 15, 2010, 15:53

Hi Hassan - Thanks for replying. I am trying to run the dsmcFOAM application. The case involves a vapor of one species expanding into low pressure inert gas of another species. I would like to know the velocity and density, or at least concentration, of the expanding gas. This is an application of rarefied gas dynamics, which is why I would also like to know local Knudsen numbers. Thanks again.

hk318i · July 15, 2010, 16:17

Unfortunately I have no experience with dsmcFoam. I felt that you are doing something like that but your title and question was not clear enough.
I think it is now clear and I hope some dsmc foamer will help you soon. :-)

Sadegh yousefi · May 2, 2018, 08:27

Hi.do you know about calculation cancentration species in dsmcfoam?

July 14, 2010, 15:06	Species Specific Fields	#1
hyperion Member Daniel Join Date: Jul 2010 Location: California Posts: 39 Rep Power: 14	Hi Foamers - Does anyone know if there is a utility or other method that would allow me to view results for individual species? Specifically, I would like to know velocity and density profiles for different species in a flow. Also, does anyone know if there is a utility that outputs local Knudsen and Courant numbers (on a cell by cell basis)? Thanks for any and all help.

May 2, 2018, 08:27	Concentration	#5
Sadegh yousefi New Member Sadegh Join Date: Nov 2017 Posts: 5 Rep Power: 7	Hi.do you know about calculation cancentration species in dsmcfoam?

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July 15, 2010, 06:26		#2
hk318i Senior Member Hassan Kassem Join Date: May 2010 Location: Germany Posts: 241 Rep Power: 16	Dear hypersion, if you are modeling single phase flow, it is impossible to calculate the velocity and density of each species. To do that you should use the a momentum equation for each specie. I think you are modeling something special not just single phase flow because you are asking about Knudsen number. It will be better to give a brief about your case. Regards, Hassan

July 15, 2010, 15:53		#3
hyperion Member Daniel Join Date: Jul 2010 Location: California Posts: 39 Rep Power: 14	Hi Hassan - Thanks for replying. I am trying to run the dsmcFOAM application. The case involves a vapor of one species expanding into low pressure inert gas of another species. I would like to know the velocity and density, or at least concentration, of the expanding gas. This is an application of rarefied gas dynamics, which is why I would also like to know local Knudsen numbers. Thanks again.

July 15, 2010, 16:17		#4
hk318i Senior Member Hassan Kassem Join Date: May 2010 Location: Germany Posts: 241 Rep Power: 16	Unfortunately I have no experience with dsmcFoam. I felt that you are doing something like that but your title and question was not clear enough. I think it is now clear and I hope some dsmc foamer will help you soon. :-)