I am preparing a conjugate heat transfer case in CFX 11.0. In my simulation there are coils of flat strips of copper separated by glass/epoxy insulation. The effective thermal conductivity in the direction normal to the insulation is ~1/10th the conductivity of copper. Can I set up anisotropic thermal conductivity?
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Set up your case in CFX-Pre and edit/define a material. Enter a dummy value for conductivity. At this point you now need to manually edit the CCL for that material definition. Export the CCL to a file and edit this file in a text editor. Find the material definitions. You should see something similar to this: LIBRARY: MATERIAL: Copper Option = Pure Substance Thermodynamic State = Solid PROPERTIES: THERMAL CONDUCTIVITY: Option = Value Thermal Conductivity = 10 [W m^-1 K^-1] END ... END END END Make changes similar to this in the CCL: LIBRARY: MATERIAL: Copper Option = Pure Substance Thermodynamic State = Solid PROPERTIES: THERMAL CONDUCTIVITY: Option = Orthotropic Cylindrical Components Thermal Conductivity X Component = 10 [W m^-1 K^-1] Thermal Conductivity Y Component = 0 [W m^-1 K^-1] Thermal Conductivity Z Component = 10 [W m^-1 K^-1] END ... END END END For anisotropic conductivity that varies in polar coordinates, use: LIBRARY: MATERIAL: Copper Option = Pure Substance Thermodynamic State = Solid PROPERTIES: THERMAL CONDUCTIVITY: Option = Orthotropic Cylindrical Components Thermal Conductivity r Component = 10 [W m^-1 K^-1] Thermal Conductivity Theta Component = 0 [W m^-1 K^-1] Thermal Conductivity Axial Component = 10 [W m^-1 K^-1] AXIS DEFINITION: Option = Coordinate Axis Rotation Axis = Coord 0.3 END END ... END END END Now you can import this CCL back into CFX-Pre and write out the definition file. Be careful not to edit this material inside of CFX-Pre. |
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