# Assigning Temperature at wall boundary

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 August 13, 2012, 00:26 Assigning Temperature at wall boundary #1 Senior Member   Ehsan Asgari Join Date: Apr 2010 Posts: 312 Rep Power: 10 Hi Guys, Does anybody know how to assign specific temperatures to wall boundary faces at each time step? The temperature value at each face is distinct and doesn't obey any particular instructions. So I don't think can make this by Define_Profie. Any Idea? I really need to know wether it's possible. tnx.

 August 13, 2012, 02:40 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 What do you mean "doesn't obey any particular instruction"? If you don't have any rule to set the value of the temperature, then there is no need to set up a simulation If you have any specific rule, this can be done with Define_Profile, even for time-dependent simulations.

 August 13, 2012, 09:39 #3 Senior Member   Ehsan Asgari Join Date: Apr 2010 Posts: 312 Rep Power: 10 Hi flotus, Tnx for replying. Actually temperature for each face is obtaind by exerting an inner loop, depending on someparameters like htc etc. Thus temperature for each node is changing at every time step. What do you think? Is there Any solution possible for this case? Tnx for caring about this issue.

 August 13, 2012, 11:06 #4 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 The implementation with a UDF should be straightforward. Could you be a bit more specific about the way the temperatures are to be calculated?

August 13, 2012, 14:19
#5
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Ehsan Asgari
Join Date: Apr 2010
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Rep Power: 10
Quote:
 Originally Posted by flotus1 The implementation with a UDF should be straightforward. Could you be a bit more specific about the way the temperatures are to be calculated?
Assume a wall boundary that has a temperature distribution T. At each face or node, temperature should be calculated within a loop at each time step. The procedure of calculating temperature is implicit and it depends mostly on convective heat transfer coeff. of the same face. After obtaining temperature of all faces, we should apply it to wall boundary and this process continues until desired time reached.

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