|
[Sponsors] |
divergence in termperature when thermal conductivity is zero |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
September 23, 2014, 04:01 |
divergence in termperature when thermal conductivity is zero
|
#1 |
New Member
Jacky
Join Date: Jul 2011
Posts: 24
Rep Power: 14 |
Hi all,
I tried to remove thermal diffusion term by giving zero value for thermal conducitivity for the working fluid but fluent returned divergence in n temperature.... Can some one suggest how to do this. Thanks & Regards, Bharat |
|
September 23, 2014, 04:12 |
|
#2 |
Senior Member
Rick
Join Date: Oct 2010
Posts: 1,016
Rep Power: 26 |
I suggest to set a value "very small"; the effect should be the same. Zero values in fluent are not good as there can be some division by zero..
|
|
September 23, 2014, 05:35 |
|
#3 | |
New Member
Jacky
Join Date: Jul 2011
Posts: 24
Rep Power: 14 |
Quote:
Thanks for your reply. I also figured same thing. Can you answer me one more thing ? I am presently modeling an enthalpy equation for mixture model for modeling boiling in porous media. In this eqn the convective flux is different from the one used by de3fault. SO I wrote a define-uds-flux macro for returning the desired value to the solver. Now when I give very small value to its diffusion coefficient, aftyer some iterations the solver gives divergence error. However this was not so in the case of energy equation..... Anmy feedback or sugggestion would be highly appreciated. Thanks & Regards, Bharat PS: I have followed fluent's udf manual for writing define-uds-flux macro. |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[ANSYS Meshing] Help with element size | sandri_92 | ANSYS Meshing & Geometry | 14 | November 14, 2018 07:54 |
Thermal conductivity issue | Jared1986 | CFX | 3 | March 20, 2014 10:38 |
Divergence problem | Smaras | FLUENT | 13 | February 21, 2013 05:03 |
IAPWS water properties + orthotropic thermal conductivity | Chander | CFX | 1 | February 29, 2012 17:26 |
Constant velocity of the material | Sas | CFX | 15 | July 13, 2010 08:56 |