PBM for polydisperse flow using MUSIG in a porous filter

Laksh · February 11, 2017, 10:38

Hello all,

I am trying to model a eulerian multiphase polydisperse flow using homogenous MUSIG. The system is air(continuous) and water(polydispersed)
To implement the mass transfer, I need to put a sink/source term for each size group.
The problem is, I want to retrieve the number/mass of each group size in the element to calculate the source term for mass transfer. I tried using the existing CFX variables like mass(), mf and mfc, but I am not sure about the location(location should be the element itself).
I also went through the "variables" file and found variables like Group I&J mass, number density etc which could be used but CFX is not accepting these variables( Form: WaterOnFilter.Group1.Mass etc)
Any help or information is highly appreciated!
Thanks

ghorrocks · February 11, 2017, 17:19

Are you applying the source in the volume or a subdomain or on a surface?

Laksh · February 12, 2017, 03:21

Hey Glenn,

I am applying the source in a subdomain

ghorrocks · February 12, 2017, 03:54

The x,y,z variables give the location if that is what you mean. Or did you mean some other location function?

Laksh · February 12, 2017, 04:02

Thanks Glenn. The mass transfer source term depends upon the mass/number of different bins in the particular mesh element. That's why the location term should change depending upon the position of the solver. I am new to cfx and i hope it clears the problem.
Thanks again for your help!

ghorrocks · February 12, 2017, 04:08

If you are saying that you need to get the element number (or a pointer to it or equivalent) so you can get the flow variables at that element number - CFX does not work that way.

If you want the distance from the point in a 3D domain for every node (ie a 3D field variable) you define the function sqrt(x*x+y*y+z*z). The function is evaluated at each node in the 3D domain and returns a scalar variable field. You do not need to refer to element numbers.

Or have I misinterpeted your question?

Laksh · February 13, 2017, 05:36

Hey Glenn,

Many thanks for your help. Just one question, can the return variable from the function be used as a location parameter? I will try to implement it and post the result!

ghorrocks · February 13, 2017, 05:41

Yes, a function can return a length, and the length can be used to define a position, such as Cartesian x,y,z.

February 11, 2017, 10:38	PBM for polydisperse flow using MUSIG in a porous filter	#1
Laksh New Member Lakshay Garg Join Date: Jan 2017 Posts: 9 Rep Power: 10	Hello all, I am trying to model a eulerian multiphase polydisperse flow using homogenous MUSIG. The system is air(continuous) and water(polydispersed) To implement the mass transfer, I need to put a sink/source term for each size group. The problem is, I want to retrieve the number/mass of each group size in the element to calculate the source term for mass transfer. I tried using the existing CFX variables like mass(), mf and mfc, but I am not sure about the location(location should be the element itself). I also went through the "variables" file and found variables like Group I&J mass, number density etc which could be used but CFX is not accepting these variables( Form: WaterOnFilter.Group1.Mass etc) Any help or information is highly appreciated! Thanks

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February 11, 2017, 17:19		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,979 Rep Power: 145	Are you applying the source in the volume or a subdomain or on a surface?

February 12, 2017, 03:21		#3
Laksh New Member Lakshay Garg Join Date: Jan 2017 Posts: 9 Rep Power: 10	Hey Glenn, I am applying the source in a subdomain

February 12, 2017, 03:54		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,979 Rep Power: 145	The x,y,z variables give the location if that is what you mean. Or did you mean some other location function?

February 12, 2017, 04:02		#5
Laksh New Member Lakshay Garg Join Date: Jan 2017 Posts: 9 Rep Power: 10	Thanks Glenn. The mass transfer source term depends upon the mass/number of different bins in the particular mesh element. That's why the location term should change depending upon the position of the solver. I am new to cfx and i hope it clears the problem. Thanks again for your help!

February 12, 2017, 04:08		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,979 Rep Power: 145	If you are saying that you need to get the element number (or a pointer to it or equivalent) so you can get the flow variables at that element number - CFX does not work that way. If you want the distance from the point in a 3D domain for every node (ie a 3D field variable) you define the function sqrt(xx+yy+z*z). The function is evaluated at each node in the 3D domain and returns a scalar variable field. You do not need to refer to element numbers. Or have I misinterpeted your question?

February 13, 2017, 05:36		#7
Laksh New Member Lakshay Garg Join Date: Jan 2017 Posts: 9 Rep Power: 10	Hey Glenn, Many thanks for your help. Just one question, can the return variable from the function be used as a location parameter? I will try to implement it and post the result!

February 13, 2017, 05:41		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,979 Rep Power: 145	Yes, a function can return a length, and the length can be used to define a position, such as Cartesian x,y,z.