CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Porous model

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   August 5, 2008, 10:29
Default Porous model
Posts: n/a
Hello, I am using the porous model of fluent for heat exchanger. I am using NTU model, fixing the heat rejection value. I set all values for the core porous model, following some results that I found with some other program like pressure drop, area. I am quite sure of this values that I input. The core friction factor was actually my only unknown that I calculate by those values. My problem is that, by post processing, I found out a pressure drop of 0.5 bars in my primary gas through the HE when I set a porous model for the heat exchanger based on a pressure drop of 100Pa. Lets say almost a coefficient of 1000. Again, I checked my values. And when you set the heat exchanger model in define, it actually affects the values of inertial resistance in the BC of the volume corresponding to the heat exchanger. After doubting of me, I allow myself to assume that it could have an error in the equation of this porous model. Is there anyone who had got the same pressure drop as he was expected using this NTU model with fluent? Please I am really screwed, so ur help will be welcome. By the way I am using fluent 6.3 Thank u in advance.

  Reply With Quote

Old   August 6, 2008, 08:20
Default Re: Porous model
Posts: n/a
I am using K-epsilon model realizable. the heat rejection is fine, temperature are OK. So it has to come from the core porous model. What can I forget in my setting of this model? thanks for ur help.
  Reply With Quote

Old   August 11, 2008, 04:16
Default Re: Porous model
Posts: n/a
I am using my own values for the core porosity model. I am having a deltaP across my HE of 500 to 1000 times more than expected. The geometry of HE model is 23 pass, 6rows by pass, 1 column by pass. Auxiliary fluid inlet direction +Y, pass to pass direction +Z. When I apply the model I can see in the porous zone tab of the Boundary conditions that direction 1 is X, and direction 2 is Y and that I have only inertial resistance in direction 2 and 3 with a value which seems 1000 times more important. I hope you understand my problem.
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to model porous jumps mat OpenFOAM Running, Solving & CFD 8 April 17, 2013 04:34
Porous model cristiano FLUENT 0 March 17, 2008 10:48
on porous momentum model yuan CFX 0 March 11, 2006 05:47
CFX 4.4 - Porous Model Joan CFX 0 October 6, 2005 14:12
How to use radiation model with porous model? jacky CFX 0 December 17, 2002 23:51

All times are GMT -4. The time now is 19:17.