CFD Online Logo CFD Online URL
Home > Forums > Fluent UDF and Scheme Programming

UDF Species source makes my temperature drop... cold fire???

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

LinkBack Thread Tools Display Modes
Old   August 2, 2011, 22:08
Default UDF Species source makes my temperature drop... cold fire???
New Member
Join Date: Nov 2010
Posts: 11
Rep Power: 9
therandomestname is on a distinguished road
Hello all:

I'm simulating a biomass gasifier, and after having lots of convergence problems with the multiphase model, I decided to use source terms to add my pyrolysis and reaction products (CO and CO2) since it's a very simple model. When I turn my species and mass source terms on, the temperature drops. I believe that this is because I am adding mass and changing specific heat and Fluent is solving the energy equation. Does anybody know what the amount of heat I have to add for this is equal to? I am new to this software and I'm not sure how Fluent handles Cps, enthalpies, and the energy equation.

Thanks a lot,

therandomestname is offline   Reply With Quote

Old   November 26, 2015, 12:12
Join Date: Sep 2013
Posts: 37
Rep Power: 6
Tleja is on a distinguished road
Hi! john

Have you solved this problem yet?

At the moment, I have the same problem.
I also use species model with mass and energy source term. Actually,my reaction is exothermic reaction. As soon as my reactant will be consumed immediately, temperature should increase basically because of heat of reaction. I already made sure about negative or positive of energy source term.

But, Temperature in my system drop a little bit. It should increase actually.
I don't know why.

Please help me! I have been solving this trouble for many week.

Tleja is offline   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
OpenFOAM on MinGW crosscompiler hosted on Linux allenzhao OpenFOAM Installation 127 January 30, 2009 20:08
DxFoam reader update hjasak OpenFOAM Post-Processing 69 April 24, 2008 01:24
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07
UDFs for Scalar Eqn - Fluid/Solid HT Greg Perkins FLUENT 0 October 13, 2000 23:03
UDFs for Scalar Eqn - Fluid/Solid HT Greg Perkins FLUENT 0 October 11, 2000 03:43

All times are GMT -4. The time now is 22:41.