Lumped System Connector (Heat Transfer in Shells Interface)

Use this node to connect the distributed finite element model to a thermal network.

The average temperature on the selected edge can be prescribed at a node of the thermal network where an External Terminal feature of The Lumped Thermal System Interface is applied.

In return, the heat rate defined at the node of the thermal network is applied on the selected edge.

Edge Selection

Select the edges on which to apply the connector. The check box makes the node applicable only if a layered material is defined on the edge. If a layered material ( with specified, , , or ) is available, its name is then displayed beside the edge index (for example, slmat1), otherwise the edge is marked as not applicable.

Note that when the is in the section of the parent interface, the check box is not editable.

In addition, in 2D, edges are modeled as points and this section is named , containing a check box.

Shell Properties

Different settings are available, depending on the settings in the Shell Properties section of the parent interface:

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When the is in the section of the parent interface, the same layered material is used in the node, but you can limit the contribution to individually selected layers by clearing the check box. For a given or , you get access to a list of check boxes for the selection of the individual layers.

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When the is in the section of the parent interface, the is in the node. You can change to and override the interface setting with a specific value or expression for Lth.

You can visualize the selected layered materials and layers in each layered material by clicking the and buttons.

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For a general description of layer and interface selections, see Layer and Interface Selection Tools.

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You can provide material parameters with a through-thickness variation by using expressions containing the extra dimension coordinate as described in Using the Extra Dimension Coordinates.


	The desired selection for the node may correspond to boundaries with different layered materials. See Layered Material, Layered Material Link, Layered Material Stack, Layered Material Link (Subnode), and Single-Layer Materials in the COMSOL Multiphysics Reference Manual.

Terminal Inputs

Select an feature in the list to define which node of the thermal network provides the heat rate Pext to be prescribed on the edge.

When the check box is not selected (default), the average temperature on the edge is constrained to the temperature at the terminal node of the thermal network. Select this check box to apply the constraint on the space-dependent temperature instead, which corresponds to a stronger constraint.

Location in User Interface

Context Menus

Ribbon

Physics tab with selected: