Thermal Coupling 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.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 non-geometric element.Note: Secondary Region Override does not support spatial distribution.When you select Total Conductance from the Type list in the Magnitude group, you must select the Per Element check box in the Distribution group because Secondary Region Override is supported only for per element total conductance.Secondary Region Override is not supported for the Conductive Gap magnitude type.
Region Side Specification
Specify Region Side to Apply to	Lets you specify which shell side of the primary region is connected to which shell side of the secondary region. You can select Top or Bottom from the Primary Region Side and Secondary Region Side lists.
Magnitude
Type	Specifies how the software calculates the thermal couplings.Total ConductanceDefines the total conductance, G, to describe the quantity of heat that flows from the hotter element to the cooler element per degree of temperature difference between the two elements. Specify the total conductance value in the Conductance box. Specify power/temperature units.Total ResistanceDefines the total resistance, R, to describe the temperature rise between two sets of elements per unit heat flow. Specify the total resistance value in the Resistance box. Specify temperature/power units.Heat Transfer CoefficientDefines conductances between the primary and secondary areas by the equation G = h × A. Specify the value of the heat transfer coefficient, h, in the Coefficient box. Specify power/(length2 x temperature) units.Edge ContactDefines conductances between primary and secondary areas by the equation G = CL × L, where L is the length of the edge. Specify the value of the conductance per length, CL, in the Conductance per Length box. Specify power/(length x temperature) units.Conductive GapDefines conductances between the primary and secondary elements by the equation G = (k × A) / L, where L is the distance to the secondary element along the primary element's surface normal, and A the area of overlap. Specify the value of the gap thermal conductivity, k, in the Gap Thermal Conductivity box. Specify the power/(length x temperature) units.For more information, see Additional magnitude options.
Additional Parameters
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 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	Available when Override Secondary Region is cleared.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.
Temperature Dependence Uses	Specifies which temperature is used to evaluate the magnitude when temperature-varying function is used. You can define a temperature dependency in table fields, formula fields, 4D fields, and table of fields.Average TemperatureUses the average temperature of primary and secondary regions to evaluate the magnitude.Primary TemperatureUses the temperature of the primary region to evaluate the magnitude.For more information, see Temperature dependency for thermal and electrical couplings.
Distribution
Per Element	Applies the specified total conductance value to each element of the selected geometry. Use this option when the selected elements are of identical size.When you clear the Per Element check box, the thermal solver distributes the specified total conductance over the selected surface.Caution: Conductance per element can only be defined for thermal couplings set with Total Conductance type. For all other thermal coupling types an error is displayed.

How do I

Create a thermal coupling

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Thermal Coupling

Specifying a Coupling Resolution

Using the Only Connect Overlapping Elements option

Using the Overlap Projection Direction option

Thermal Coupling magnitude types

Temperature dependency for thermal and electrical couplings

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Thermal Coupling options, Simcenter 3D 2021.1 Series

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