CFD Online Logo CFD Online URL
Home > Forums > FLUENT

poor calculation with temparture-dependant specific heat

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

LinkBack Thread Tools Display Modes
Old   December 30, 2012, 04:29
Unhappy poor calculation with temparture-dependant specific heat
New Member
Join Date: Dec 2010
Posts: 12
Rep Power: 6
ryanmoser is on a distinguished road
I am trying to simulate the melting process with the method of effective heat capacity, which requires FLUENT to solve energy equations with changing specific heat. I wrote a udf to specify the specific heat. However, it doesn't help. Temperature rising rate is far beyond what it should be.
Then I tried to work with the constant specific heat, and the result was more acceptable, but not precise enough.
Could anyone tell me what should I be aware of to improve the iteration stability and precision with temperature-dependent property?
Thank you so much!
ryanmoser is offline   Reply With Quote

Old   December 30, 2012, 06:59
Super Moderator
Far's Avatar
Sijal Ahmed Memon (
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,994
Blog Entries: 6
Rep Power: 39
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
I guess it the problem of core flow physics available in Fluent rather than the specific heat.
Far is offline   Reply With Quote

Old   January 2, 2013, 09:43
Join Date: Dec 2012
Posts: 79
Rep Power: 4
beer is on a distinguished road
Did you consider setting the enthalpy, too? This was a problem in my first simulations with temperature-dependent Cp.
beer is offline   Reply With Quote

Old   January 3, 2013, 02:32
Senior Member
Join Date: Oct 2012
Posts: 227
Rep Power: 5
msaeedsadeghi is on a distinguished road
Yes, You should also decrease energy URF.
msaeedsadeghi is offline   Reply With Quote


temperature dependence

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
Radiation interface hinca CFX 15 January 26, 2014 18:11
Enforce bounds error with heat loss boundary condition at solid walls Chander CFX 2 May 1, 2012 20:11
error message cuteapathy CFX 14 March 20, 2012 07:45
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Integral specific heat Steve Amphlett Main CFD Forum 0 August 25, 2000 09:51

All times are GMT -4. The time now is 00:26.