Importing TSS radiation models

When you import a Thermal Desktop TSS radiation model, Simcenter 3D names the mesh collectors of the imported elements using the TSS submodel names.

When you store the user_input.dat customization file in the same directory as the TSS import files (*.tssgm, *.tssma, *.tssop), you can request that Simcenter 3D:

• Creates a CSV file, which contains a map between the TSS primitives and the created primitive elements.

• Names the groups of imported elements using the TSS submodel names. These groups are created in the FEM and contain all primitive elements of one submodel. You can use these groups in an Assembly FEM.

• Offsets top and bottom primitive elements. These offset elements are created with their respective top or bottom thermo-optical properties.

• Imports cylinder primitives with specified number of elements in the circumference.

Customization through a file

The user_input.dat file is a text file that can contain the following lines.

OUTPUT_CSV .csv

Creates a CSV file, which contains a list of all primitives and associated elements. It maps the TSS primitive name and IDs with Simcenter 3D element information. You can customize the name of the output file in .csv. The default name of the CSV file is rad_import.csv.The format of the CSV file is as follows for each imported TSS primitive (one per line):,.,<Simcenter 3D element ID of first primitive element>,<Simcenter 3D element ID of second primitive element>,...

CYLINDER_CIRCUMFERENCE_DENSITY

Defines number of elements in the circumference when importing a cylinder primitive. By default, Simcenter 3D creates the cylinder primitive with 24 elements in the circumference.

TOP_BOTTOM_OFFSET

Recreates the primitive elements with a small offset , when a top/up or bottom/down side is detected in the *.tssgm file. The top or bottom side has an additional TSS node ID that is offset by the top or bottom offset ID. is a percentage of the largest thickness present in the *.tssgm file. For an offset of 5%, is 0.05. Simcenter 3D creates:Top additional primitives in their own null shell mesh collectors with UP appended to the original primitive name. They are offset in the normal direction and have their optical properties assigned to the top side. The original thin shell mesh collectors have their optical properties assigned only to the bottom side.Bottom additional primitives in their own null shell mesh collectors with DOWN appended to the original primitive name. They are offset in the direction opposite to the normal and have their optical properties assigned to the bottom side. The original thin shell mesh collectors have their optical properties assigned only to the top side.

TOP_ID_OFFSET

Specifies a top offset ID of coming from Thermal Desktop for TSS top side. The top offset is 10000, by default.

BOTTOM_ID_OFFSET

Specifies a bottom offset ID of coming from Thermal Desktop for TSS bottom side. The bottom offset is 20000, by default.

Example user_input.dat

OUTPUT_CSVCYLINDER_CIRCUMFERENCE_DENSITY 8TOP_BOTTOM_OFFSET 0.20

Example:

When this file is present during a TSS radiation model import, Simcenter 3D creates:

• rad_import.csv file

• 8 elements in the circumference for the imported cylinder primitives

• Top and bottom primitive elements with an offset of 20% with respect to the original primitives

How do I

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Import options for Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Supported features for importing radiation models

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Importing TSS radiation models, Simcenter 3D 2021.1 Series

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