Separated flow and multiphase in the same analysis?

authent · July 24, 2015, 14:07

Hi everyone!

I'm new at setting multiphase cases. I'm trying to simulate a pipe with a water-vapor mixture on the inside and any gas (air, co2) on the outside.

A similar case would be a double pipe heat exchanger.

It's important to say that there's no mass exchange, they are separated domains (zones).

The problem is that when I define the multiphase water-vapor mixture, I'm allowed only to use that mixture for all the fluids in the cell zone settings, excluding my precious cover gas.

Thank you in advance!

CeesH · July 31, 2015, 10:35

Split the domain in 2 zones in your meshing editor, using a named selection to specify each zone. Then, you can set conditions separately for each zone under 'cell zone conditions' in FLUENT

Best,
Cees

authent · July 31, 2015, 13:36

Thank you CeesH, but splitting the model into 2 or more zones won't help. As we did a little research, came up with this:

http://www.sciencedirect.com/science...17931012008174

The author states that "As stated in the FLUENT user’s guide, in modelling heat transfer in two separated fluid regions involving multispecies, only a single mixture material for the entire domain can be used." [3. Solution procedures - pg. 713]

July 24, 2015, 14:07	Separated flow and multiphase in the same analysis?	#1
authent New Member Ignacio Join Date: Sep 2013 Posts: 2 Rep Power: 0	Hi everyone! I'm new at setting multiphase cases. I'm trying to simulate a pipe with a water-vapor mixture on the inside and any gas (air, co2) on the outside. A similar case would be a double pipe heat exchanger. It's important to say that there's no mass exchange, they are separated domains (zones). The problem is that when I define the multiphase water-vapor mixture, I'm allowed only to use that mixture for all the fluids in the cell zone settings, excluding my precious cover gas. Thank you in advance!

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July 31, 2015, 10:35		#2
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	Split the domain in 2 zones in your meshing editor, using a named selection to specify each zone. Then, you can set conditions separately for each zone under 'cell zone conditions' in FLUENT Best, Cees

July 31, 2015, 13:36		#3
authent New Member Ignacio Join Date: Sep 2013 Posts: 2 Rep Power: 0	Thank you CeesH, but splitting the model into 2 or more zones won't help. As we did a little research, came up with this: http://www.sciencedirect.com/science...17931012008174 The author states that "As stated in the FLUENT user’s guide, in modelling heat transfer in two separated fluid regions involving multispecies, only a single mixture material for the entire domain can be used." [3. Solution procedures - pg. 713]