CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Derivatives wrt Temperature

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 24, 2014, 18:33
Default Derivatives wrt Temperature
  #1
New Member
 
Deepak Kalaikadal
Join Date: Feb 2014
Posts: 6
Rep Power: 12
kalaikdr is on a distinguished road
How do I calculate derivative of a fluid property wrt temperature, like d(rho)/dT or d(viscosity)/dT?
I am working on heat transfer in two phase systems where temperature gradients create vast differences in properties.

Are there schemes to calculate these derivatives? I could find only divergence, laplacian and grad schemes. How do i incorporate a new discretization scheme for a derivative like above? I am currently using interFOAM with temeperature incorporated!

Thanks!

Last edited by kalaikdr; April 24, 2014 at 23:26. Reason: Add Information
kalaikdr is offline   Reply With Quote

Old   April 25, 2014, 04:19
Default
  #2
Senior Member
 
Join Date: Oct 2013
Posts: 397
Rep Power: 18
chriss85 will become famous soon enough
Quote:
Originally Posted by kalaikdr View Post
How do I calculate derivative of a fluid property wrt temperature, like d(rho)/dT or d(viscosity)/dT?
I am working on heat transfer in two phase systems where temperature gradients create vast differences in properties.

Are there schemes to calculate these derivatives? I could find only divergence, laplacian and grad schemes. How do i incorporate a new discretization scheme for a derivative like above? I am currently using interFOAM with temeperature incorporated!

Thanks!
You might have to extend the thermophysical model that you're using, to provide a function that calculates this derivative. Then you can use it in the equation you are solving. Depending on the model this can be an analytical or numerical derivative.
chriss85 is offline   Reply With Quote

Old   June 5, 2014, 14:19
Default
  #3
New Member
 
Deepak Kalaikadal
Join Date: Feb 2014
Posts: 6
Rep Power: 12
kalaikdr is on a distinguished road
Thank you Chriss. But I ended up giving a constant value for the derivative. It was a very small magnitude anyway.
kalaikdr is offline   Reply With Quote

Reply

Tags
discretization schemes, temperature derivatives

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
whats the cause of error? immortality OpenFOAM Running, Solving & CFD 13 March 24, 2021 07:15
Static Temperature / Opening Temperature JulianP CFX 12 April 10, 2019 18:00
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
is internalField(U) equivalent to zeroGradient? immortality OpenFOAM Running, Solving & CFD 7 March 29, 2013 01:27
Can we have access temperature derivatives??? behrang2009 Fluent UDF and Scheme Programming 0 July 29, 2010 19:21


All times are GMT -4. The time now is 02:38.