Orthotropic and anisotropic thermal conductivity

When you specify an orthotropic material you must enter the values for Thermal Conductivity (K), Thermal Conductivity (K2), and Thermal Conductivity (K3) in the Orthotropic Material dialog box.

When you specify an anisotropic material, you enter the values for the six thermal conductivity terms in the Thermal Conductivity (Kij) group in the Anisotropic Material dialog box. You must define the diagonal terms. The magnitude of each off-diagonal term that you define must be less than the magnitude of the smallest diagonal term. If you do not define the off-diagonal terms, they are set to 0.

In addition to the Cartesian coordinate system, you can also use material orientation in the cylindrical and spherical coordinate systems. The following table shows the correspondence between the values and the three coordinate systems.

Material Orientation Type	Thermal Conductivity (K) and (K11)	Thermal Conductivity (K2) and (K22)	Thermal Conductivity (K3) and (K33)
Cartesian	kx	ky	kz
Cylindrical	kr	kθ	kz
Spherical	kr	kθ	kφ

These values are assigned to the elements according to the material orientation method you use in the 2D or 3D mesh collector dialog boxes.

You can use one of the following material orientation methods:

• Coordinate System

• Orientation Angle

• Tangent Curve

• Vector

• Spatial Field (only 3D collectors)

How do I

Define thermo-optical properties

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Define 2D element material orientation (Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal)

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Thermo-optical properties

Managing thermo-optical properties

Inspecting thermo-optical properties

Modeling phase change

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Thermal material properties

Understanding bidirectional reflectance angles

Bidirectional reflectance distribution functions (BRDF)

Inspect Thermo-Optical Properties dialog box

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Orthotropic and anisotropic thermal conductivity, Simcenter 3D 2021.1 Series

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