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Plot of user defined variable in CFD Post

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Old   December 8, 2013, 22:00
Default Plot of user defined variable in CFD Post
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Mine is a heat transfer problem. I plot temperature contours in my whole domain. In my problem I want to have a similar plot for non-dimensional temperature. For the same I will need to define a new variable theta. I think this is possible in expression under CFD POST. My theta expression is like this:

theta = (temp-20)/(80);

now, this variable temp is undefined..
Under expressions, their is no variable for the temperature. what variable does FLUENT use to depict the temperature?

I referred Cornell university's tutorials. What I think, is I need to define a new variable temp which will be in the whole domain, then define theta in terms of it? Am I right? If yes, how exactly to do it?
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