User Function options

Name
Name	Lets you specify a name for the simulation object.Description opens an editor that lets you type a description for the constraint.
Destination Folder
Simulation Object Container	Specifies the folder in the Simulation Navigator in which the boundary condition will be stored. The list includes the root container and existing folders that you created using the New Folder command. Examples of a root container include Load Container, Constraint Container, and Simulation Object Container.
Folder Manager	Displays a hierarchical listing of existing folders. To create a new folder, right-click any level of the hierarchy and choose New Folder.
Primary Region/Secondary Region
Group Reference	Lets you apply the primary or secondary coupling region to a group.For more information, see Group Reference options.
Select Object	Lets you select both the primary and secondary sets of elements, or the geometry containing them.Element Selection Filtering lets you limit your element selection to the FE entity you select from the Filter Type list:0D Elements, 1D Elements, or 2D Elements lets you select only elements of that order.Element Edges lets you select 1D elements, the edges of 2D, or 3D elements.Element Faces lets you select 2D elements or the faces of 3D elements.Caution: You must select Element from the main selection Type Filter list to use the Element Selection Filtering options.Excluded lets you remove individual entities from within your selected object.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Secondary Region Override
Override Secondary Region	Overrides the secondary region with a non-geometric element.Non-Geometric ElementCreates a thermal coupling between the primary region and the non-geometric element. Select an existing non-geometric element modeling object from the list, or click Create Modeling Object to create a new non-geometric element.
Parameters
Correlation Number	Specifies the value of the variable ITAB from your user defined subroutine USERF.
Coupling Resolution	Controls the accuracy of the coupling. The software subdivides primary elements according to the Coupling Resolution before it determines conductances. With the One to One resolution, the solver calculates a single conductance from each primary element to the nearest secondary element.With the Coarse through Finest resolutions, the software subdivides each primary element is divided into a progressively larger number of sub-elements.Although it may seem that the finer subdivision level would produce more accurate results, this is not always the case.For more information, see Specifying a Coupling Resolution.
Only Connect Overlapping Elements	Connects only primary sub-elements to secondary elements that overlap.For more information, see Using the Only Connect Overlapping Elements option.
Overlap Projection Direction	Available when Only Connect Overlapping Elements is selected.Specifies whether the normal of the primary or secondary elements is used to calculate the area of overlap.For more information, see Using the Overlap Projection Direction option.

How do I

Create a 1 Way Thermal Coupling

Create a user function thermal coupling

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User function thermal coupling

Inputs to expressions

Specifying a Coupling Resolution

Using the Only Connect Overlapping Elements option

Using the Overlap Projection Direction option

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1 Way options

Auto-generated expressions

Thermal Coupling — Advanced dialog box

Quick links

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

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User Function options, Simcenter 3D 2021.1 Series

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