# Anisotropic Heat Transfer Setup Quesitons (WB 14.5)

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September 26, 2013, 08:57
Anisotropic Heat Transfer Setup Quesitons (WB 14.5)
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Hi everyone, after spending considerable time searching I still require help for a simulation I am attempting on Workbench CFX 14.5. I will walk through what I've done so far to provide any potential help with as much info as possible.

I am attempting to setup a simple heat conduction simulation through a small square sample of carbon fiber reinforced plastic (CFRP). My first issue was attempting to create an anisotropic material to represent the CFRP. I had found through these forums a .ccl that is supposed to work:

Quote:
 LIBRARY: &replace MATERIAL: CFRP Material Group = User Option = Pure Substance Thermodynamic State = Solid PROPERTIES: Option = General Material EQUATION OF STATE: Density = 1800 [kg m^-3] Molar Mass = 1 [kg kmol^-1] Option = Value END REFERENCE STATE: Option = Specified Point Reference Specific Enthalpy = 0 [J kg^-1] Reference Temperature = 25 [C] END SPECIFIC HEAT CAPACITY: Option = Value Specific Heat Capacity = 950 [J kg^-1 K^-1] END THERMAL CONDUCTIVITY: Option = Orthotropic Cartesian Components Thermal Conductivity X Component = 6.3 [W m^-1 K^-1] Thermal Conductivity Y Component = 0.6 [W m^-1 K^-1] Thermal Conductivity Z Component = 0.6 [W m^-1 K^-1] END END END END

It displays an error that I was told could be suppressed because its only an issue with the GUI:

Quote:
 The parameter "Option" in "/LIBRARY/MATERIAL:CFRP1/PROPERTIES/THERMAL CONDUCTIVITY" has the value "Orthotropic Cartesian Components". This does not match any of the allowed values: "Value, Kinetic Theory Model".
So I suppressed it. Moving on to creating a domain, in which to assign a material to my small sample, I run into the issue I'm currently stuck on:

When I create a new domain, I select it's location and set it to a Solid Domain type. Then when I want to set the material, I may only choose from Aluminum, Steel or Copper in both the CHT Solids and Particulate Solids drop-down choices in the library [...] button.

I had read on here that you may append the solution details in Post and replace the material with the Orthotropic material, but I wouldn't know the first thing about doing that. I hope somebody can help me with this, I feel that this is the only major roadblock to my simulation.

 October 11, 2013, 08:11 #2 New Member   Join Date: Sep 2013 Location: DE/US Posts: 2 Rep Power: 0 Anybody?

 October 12, 2013, 06:40 #3 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,808 Rep Power: 107 When I generate a new material I just copy an existing one and edit it to the new properties. Simple. CFX-Pre does not have the full CCL for some advanced models - this may be one example. If the solver accepts this and runs OK then all is good.

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