Thermal Coupling — Radiation dialog box (Thermal/SST/ESC/Multiphysics)

Option	Description
Type	Lets you control how the software creates the conductance.Gap Radiation models radiative heat paths between close parallel surfaces with known emissivity. With this type, the view factor is effectively 1 so radiative conductance is based solely on emissivity.Object to Object Radiation models radiation heat transfer between objects that are not close to one another and where the assumption of view factor = 1.0 is not valid.
Name	Lets you specify a name for the simulation object.
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 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.
Magnitude
Type	Lets you control how the software calculates the couplings.Close Parallel Plates uses the emissivities of the two element sets to calculate the radiative conductances. The software assumes that the two element sets are on flat parallel plates that are close to each other.Gray Body View Factor calculates the radiative conductances based on the gray body view factor value that you specify.Effective Emissivity calculates the radiative conductances based on the effective emissivity value that you specify. Effective emissivity = emissivity x gray body view factor, where emissivity is the emissivity of the primary elements.
Gray Body View Factor	Appears when Type is set to Gray Body View Factor.Sets the value for the Gray Body View Factor.
Emissivity * Gray Body View Factor	Appears when Type is set to Effective Emissivity.Sets a value for the effective emissivity.
Additional Parameters
Appears when Type is set to Gap Radiation.
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.
Only Connect Overlapping Elements	Controls how the software establishes the conductances between the selected elements.
Overlap Projection Direction	Available when the Only Connect Overlapping Elements is selected.Controls whether the normal of the primary or secondary elements is used to calculate the area of overlap.

How do I

Create a Thermal Coupling — Radiation

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Thermal Coupling — Radiation

Specifying a Coupling Resolution

Using the Only Connect Overlapping Elements option

Using the Overlap Projection Direction option

Understanding the Gap Radiation type of Thermal Coupling — Radiation

Understanding the Object to Object type of Thermal Coupling — Radiation

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Thermal Coupling — Radiation dialog box (Thermal/SST/ESC/Multiphysics), Simcenter 3D 2021.1 Series

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