Multiple Thermal Conductivity for a Material at different temperature
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?
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).
This looks like it is in CFX. Try putting square brackets around K. Like this:
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