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How can I make an interpolated function?

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Old   November 18, 2006, 04:38
Default How can I make an interpolated function?
  #1
Se-Hee
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Dear All,

I am trying to make the heat transfer coefficient function, h(T), with respect to T. I have some sampled data sets as follows:

T:: 280 290 300 350 400

h(T):: 2 7 8 12 14

Here, I'd like to make an interpolated function of which name is 'myH.' Where can I setup this kind of function and how can I use it?

Many Thanks, Se-Hee
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Old   November 19, 2006, 17:19
Default Re: How can I make an interpolated function?
  #2
Glenn Horrocks
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Hi,

This is a CEL 1-d interpolation expression. It is described in the documentation.

Glenn Horrocks
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Old   November 20, 2006, 03:23
Default Re: How can I make an interpolated function?
  #3
Se-Hee
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Dear Mr. Glenn,

Thanks for your comments. I have built my own interpolated function followed by your guide as follows:

1) In CFX-Pre, Create/User function

2) My function name is 'myHCoeff'

3) Interpolation, One dimensional

4) Input data set: Temperature .vs. heat transfer coefficient

5) OK

And when I use this function as boundary condition, how can I express the function? There were some errors to express my defined function when I try to use it. My expression was 'myHCoeff(T).' Is it incorrect?

Many thanks,

Se-Hee
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Old   November 20, 2006, 11:52
Default Re: How can I make an interpolated function?
  #4
Robin
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What were the errors?
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Old   November 22, 2006, 19:08
Default Re: Error Message
  #5
Se-Hee
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The error message is as follows:

The variable 'T' referenced in parameter 'Heat Transfer Coefficient' in object '/Flow/Domain:Tank/Boundary:TankH/Boundary Conditions/Heat Transfer' does not have one of the required prefixes: phase or particle.

Thanks for your help.

Se-Hee
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Old   November 24, 2006, 00:44
Default what is the prefixes: phase or particle?
  #6
Se-Hee
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As I mentioned in the above message, the error message was as follows:

The variable 'T' referenced in parameter 'Heat Transfer Coefficient' in object '/FLOW/DOMAIN:Tank/BOUNDARY:TankH/BOUNDARY CONDITIONS/HEAT TRANSFER' does not have one of the required prefixes: phase or particle.

Here, could anyone please explain 'phase or particle'? I've tried many ways for resolving my problem, but I am still stuck at this stage.

Se-Hee
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Old   November 24, 2006, 06:32
Default Re: what is the prefixes: phase or particle?
  #7
Johnny
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If you have a multiphase flow, you need to add the phase/particle name before variables. Example:

Air Ideal Gas.Temperature

Maybe this is what the error message is referring to?
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Old   November 25, 2006, 07:30
Default Re: solved this problem with input profile.
  #8
Se-Hee
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Considering your comments, I have solved this problem at last as follows:

1. making profile instead of table

2. retype the function -> myHCoeff.hval(WireAl.T)

where myHCoeff represents the function name of which I defined, hval represents the value of my function with reapect to temperature, and WireAl represents the material name of which I used in my simulation setup.

Thanks for all kind comments.

Se-Hee
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