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When the Shell type is Layered shell in the Shells Properties section of the parent node, the Shell type is Layered shell as well in the Heat Source node. This option is not editable, but you can limit the contribution to individually selected layers by clearing the Use all layers check box. For a given Layered Material Link, Layered Material Stack, or Single Layer Material, you get access to a list of check boxes for the selection of the individual layers.
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When the Shell type to Nonlayered shell in the Shells Properties section of the parent node, the Shell type is taken From parent feature in the Heat Source node. You can change to Nonlayered shell and override the parent node setting with a specific value or expression for the Thickness Lth.
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See Layered Material, Layered Material Link, Layered Material Stack, Layered Material Link (Subnode), and Single-Layer Materials in the COMSOL Multiphysics Reference Manual.
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The default option for the Heat Source node is Solid when added under Thin Layer and Fracture, which specifies that the heat source Qs is defined in the material frame. Because the heat transfer variables and equations are defined in the spatial frame, the inputs are internally converted to the spatial frame. See Conversion Between Material and Spatial Frames for details.
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The From material option uses the option selected in the Material type list of the Material Properties section of the material applied on the domain on which the node is active.
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For Heat rate define the heat rate Ps. In this case Qs = Ps ⁄ V where V equal to the volume of the layer selection.
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You can specify the source to be a harmonic perturbation in a frequency domain analysis. To mark the source as being a harmonic perturbation, right-click the node and choose Harmonic Perturbation. Note that this updates the node’s icon. See Theory for Harmonic Heat Transfer for more details.
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