Initial Values (Heat Transfer in Shells interface)
This node adds an initial value for the temperature that can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear solver. If more than one set of initial values is needed, add an Initial Values node from the Physics toolbar.
Layer Selection
Select the applicable layers (the default setting is All layered materials) defining the required material properties for the node.
If no layered materials have been included yet, there is a shorthand available for creating a Single Layer Material, a Layered Material Link, or a Layered Material Stack (the plus, next to the Layered Material list).
When a layered material stack or link is selected from the Layered Material list, unselect the check boxes corresponding to layers where the node should not be applied in the Selection table.
You can visualize the selected layered materials and layers in each layered material by clicking the Layer cross section preview and Layer 3D preview buttons.
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For a general description of layer and interface selections, see The Layer Selection and Interface Selection Sections.
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You can provide material parameters with a through-thickness variation by explicitly or implicitly 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. The All layered materials option allows to gather these materials to make the desired selection applicable for the node on the union of the boundaries where the layered materials are defined.
See Layered Material, Layered Material Link, Layered Material Stack, Layered Material Link (Subnode), and Single Layer Material in the COMSOL Multiphysics Reference Manual.
Initial Values
For User defined, enter a value or expression for the initial value of the Temperature T. The default is approximately room temperature, 293.15 K (20º C). Else, select an Ambient temperature defined in an Ambient Thermal Properties node under Definitions.
Theory for Heat Transfer in Thin Structures
Disk-Stack Heat Sink: Application Library path Heat_Transfer_Module/Thermal_Contact_and_Friction/disk_stack_heat_sink
Location in User Interface
Context menus
 Heat Transfer in Shells>Initial Values
Heat Transfer in Films>Initial Values
Heat Transfer in Fractures>Initial Values
Ribbon
Physics Tab with Heat Transfer in Shells selected:
Boundaries>Heat Transfer in Shells>Initial Values