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Assumptions and limitations for importing a model
The following section describes the Thermal Model Exchanger assumptions and limitations when you import a Simcenter 3D Space Systems Thermal model into Thermal Desktop.
Importing temperature constraints
You can use Thermal Model Exchanger to import Temperature constraints from Simcenter 3D Space Systems Thermal to Thermal Desktop.

User documentation
- Introduction
  Thermal Model Exchanger is a Windows application that allows you to transfer thermal models between Ansys Thermal Desktop^TM and Simcenter 3D Space Systems Thermal. The application supports the transfer of meshes, material and optical properties, and boundary conditions of your model.
- Thermal Model Exchanger user interface
  The Thermal Model Exchanger user interface consists of a top border bar and an information window.
- How to use Thermal Model Exchanger
  The following section describes how to use Thermal Model Exchanger to transfer thermal models between Thermal Desktop and Simcenter 3D Space Systems Thermal.
- Simcenter 3D entities supported by Thermal Model Exchanger
  This page summarizes the Simcenter 3D Space Systems Thermal entities supported by the Thermal Model Exchanger during the import.
- Thermal Desktop entities supported by Thermal Model Exchanger
  This page summarizes the Thermal Desktop entities supported by the Thermal Model Exchanger during the export.
- Assumptions and limitations for importing a model
  The following section describes the Thermal Model Exchanger assumptions and limitations when you import a Simcenter 3D Space Systems Thermal model into Thermal Desktop.
  - Importing meshes
    You can use Thermal Model Exchanger to import 0D, 1D, 2D and 3D meshes from Simcenter 3D Space Systems Thermal to Thermal Desktop.
  - Importing thermo-physical properties
    Thermal Model Exchanger supports importing thermal and physical properties from Simcenter 3D Space Systems Thermal into Thermal Desktop.
  - Importing thermal loads
    Thermal Model Exchanger supports importing the Heat Load and Heat Flux types of Simcenter 3D Space Systems Thermal Thermal Loads. It converts these entities into the Total Load and Flux types of Thermal Desktop Heat Load, respectively.
  - Importing temperature constraints
    You can use Thermal Model Exchanger to import Temperature constraints from Simcenter 3D Space Systems Thermal to Thermal Desktop.
  - Importing thermal couplings
    You can use Thermal Model Exchanger to import Thermal Coupling simulation objects from Simcenter 3D Space Systems Thermal into Thermal Desktop as Contactors.
  - Importing radiation
    You can use Thermal Model Exchanger to import Radiation simulation objects from Simcenter 3D Space Systems Thermal to Thermal Desktop.
  - Importing orbits and space environments
    You can use Thermal Model Exchanger to import Orbit modeling objects and Orbital Heating simulation objects from Simcenter 3D Space Systems Thermal into Thermal Desktop as External Heating Environment boundary conditions.
  - Importing a solution
    Thermal Model Exchanger supports importing solutions from Simcenter 3D Space Systems Thermal into Thermal Desktop.
- Assumptions and limitations for exporting a model
  The following section describes the Thermal Model Exchanger assumptions and limitations when you export a Thermal Desktop model to a Simcenter 3D Space Systems Thermal XML file.
- Legal notice

Importing temperature constraints

You can use Thermal Model Exchanger to import Temperature constraints from Simcenter 3D Space Systems Thermal to Thermal Desktop.

You can import Temperature constraints applied on 2D, 3D, 1D, and 0D elements, as well as element faces and edges. You must surface coat 3D elements with 2D null shell elements to import the temperature constraints applied on 3D polygon or element faces.

In Thermal Desktop, the temperature constraint is applied on nodes by setting the Node type to Boundary and selecting the Override calculations by elements/surfaces check box. The temperature magnitude value is defined in the Initial temp box.

The following table shows how Thermal Model Exchanger (TMX) converts the Simcenter 3D Temperature constraint into Thermal Desktop boundary node temperature depending on element and node configurations.


Context	Simcenter 3D elemental temperature location	Thermal Desktop nodal temperature location
When a node is attached to a single edge, TMX applies the temperature constraint on the node.
When a node is attached to multiple edges, TMX applies the averaged temperature value from the edges on the node.
Within a 2D element or an element face, all the nodes have the same temperature constraint.
When two 2D elements or element faces share nodes and have a different temperature constraint, TMX applies the averaged temperature to the shared nodes.

TMX supports time-dependent temperature constraints. Temperature constraints with other unsupported dependencies are imported as a constant using the first value of the table. The application displays a warning in the import summary.

When the context requires that TMX calculates an average, it ignores all dependencies, and it imports the temperature constraint as a constant using the first value of the table.