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-   -   How to get the temperature gradient in CFX post (http://www.cfd-online.com/Forums/cfx/26229-how-get-temperature-gradient-cfx-post.html)

Jay August 7, 2008 15:32

How to get the temperature gradient in CFX post
 
In order to calculate the entropy, I need to get the temperature gradient and velocity gradient, how can I get the temperature gradient easily from the CFX-post? thanks

CycLone August 9, 2008 15:35

Re: How to get the temperature gradient in CFX pos
 
The gradient is calculated by the solver, as is entropy etc. Entropy should already be in your results file, but if the gradient isn't you may need to turn on "output variable operators" in CFX-Pre under the Output Control panel.

-CycLone

Jay August 9, 2008 20:51

Re: How to get the temperature gradient in CFX pos
 
Yeah, I can get the Entropy, but what I want is the entropy generation in unit volume, so I need the temperature gradient. anyone has an idea, thanks

alquimista November 15, 2012 12:23

I found this post looking for the same question. I solved it in the "Variables" tab of CFD-Post with:

-right click on "Derived"
-Method => Gradient
-Gradient of => Temperature

ronggehejiumeizuiguo January 7, 2015 04:23

Quote:

Originally Posted by alquimista (Post 392306)
I found this post looking for the same question. I solved it in the "Variables" tab of CFD-Post with:

-right click on "Derived"
-Method => Gradient
-Gradient of => Temperature

hi,alquimista
i solved it by dividing the static enthalpy gradient by Cp of water,i compare the two method u and my,the deviation is too large.
i dont know how to choose.


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