|April 17, 2013, 20:24||
Multiple Thermal Conductivity for a Material at different temperature
Join Date: Feb 2013
Posts: 29Rep Power: 4
I am trying to create a material in ANSYS that has a different thermal conductivity at different temperatures. I tried the following:
Creating a function "Function 1" with my data:
-Argument Units: K
-Output Units : W m^-1 K^-1
Creating an expression "Expression 1" linked to the function:
-Expression 1= Function 1(K)
This gives me the following error:
Bad expression value 'Expression 1' detected in parameter 'Thermal Conductivity' in object '/LIBRARY/MATERIAL:Zirconium/PROPERTIES/THERMAL CONDUCTIVITY'.
The following unrecognised name was referenced: K.
Which basically says that I can't use K as the input to my function?
|April 18, 2013, 02:59||
Join Date: Apr 2013
Posts: 5Rep Power: 4
from the info you have given, it seems that you have tried to modify an element's properties from the MATERIALs library. Something is wrong with you re-definition. Could you provide additional info - what module of ANSYS do you use?
Possible solutions for the definition of temperature dependence of thermal conductivity:
1. if you use Transient module, you can specify temperature dependence of thermal conductivity in a Table form in the section 'Engineering Data'.
2. if you use FLUENT module, you can define a User-Defined Function (code it in C) and either compile or interpret it, and then use this function in material's properties specification. (There is a reference guide on how to make the User-Defined Functions in FLUENT).
|April 20, 2013, 10:15||
Join Date: Feb 2010
Location: Calgary, Alberta, Canada
Posts: 26Rep Power: 7
This looks like it is in CFX. Try putting square brackets around K. Like this:
|interpolation data, thermal conductivity, user material|
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