Deposited Beam Power, Interface (Heat Transfer in Shells Interface)

This node models heat sources brought by narrow beams, such as laser or electron beams, to the exterior interfaces of a shell and, for the case of a layered shell, to the interfaces between its layers.

Boundary Selection

Select the boundaries on which to apply the heat source.

In addition, select the check box to make the node applicable only if a layered material is defined on the boundary. If a layered material ( with specified, , , or ) is available, its name is then displayed beside the boundary index (for example, slmat1), otherwise the boundary is marked as not applicable.

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

Interface Selection

Set the interfaces for which the heat source contribution should be applied. These can be internal interfaces between layers or the top and bottom surfaces.

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 available options in the list are , , , , , and . With the last option you can select any set of interfaces for a given layered material, by clearing the check boxes corresponding to layer interfaces where the node should not be applied in the table. The top and bottom interfaces refer respectively to the upside and downside of the boundary, defined from the orientation of the normal vector. See Interface Selections for more details on the interfaces identification.

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When the is in the section of the parent interface, a single layer material is defined on the boundary, and the available options in the list are , , and . This setting has no effect unless the temperature differs from one side of the boundary to the other.

You can visualize the selected interfaces 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.


	Upside and downside settings can be visualized by plotting the global normal vector (nx, ny, nz), that always points from downside to upside. Note that the normal vector (ht.nx, ht.ny, ht.nz) may be oriented differently. See Tangent and Normal Variables in the COMSOL Multiphysics Reference Manual.

Beam Orientation

Enter a value for the e. This vector does not need to be normalized. In 2D axisymmetric components, it is aligned with the z-axis.

Beam Profile

Either select an option for the among the , or set the it as by entering a value for the , I0 (SI unit: W/m2). The corresponds to the beam intensity in the beam cross section.

For , enter a value for the P0 and the coordinates of the O.

Then, select a : (default) or .

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For , enter the σ.

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For , enter the R. Smoothing can be applied by entering a positive ΔR. The default value of 0 m corresponds to an ideal discontinuous top-hat profile.


	The standard deviation of the Gaussian distribution and the radius of the top-hat distribution can take values smaller than the mesh element size. For more accurate results, it is important to refine the mesh enough at the deposited heat source location. Otherwise, an automatic substitution replaces the standard deviation σ or the beam radius R by the minimum length to get acceptable results which depends on the mesh element size.

Location in User Interface

Context Menus

Ribbon

Physics tab with selected in the model tree: