COMSOL 6.3 - Body Load

Add a to domains for modeling general volumetric loads.

For loads caused by gravity or rotation, it is more convenient to use the Gravity and Rotating Frame nodes.


	This section is only present in the Layered Shell interface, where it is described in the documentation for the Body Load node.

Coordinate System Selection

The is selected by default. The list contains all applicable coordinate systems in the model. Prescribed loads are specified along the axes of this coordinate system. See Coordinate Systems and in the COMSOL Multiphysics Reference Manual.

Force

Select a Load type — , , or , then enter values or expressions for the components based on the selection and the space dimension. For 2D components, it is possible to specify the or the .

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After selecting a , the list normally only contains . When combining with another physics interface that can provide this type of load, it is also possible to choose a predefined load from this list.

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For , COMSOL Multiphysics divides the total force by the volume of the domains where the load is active.

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For 2D components, and if or is selected, the body load as force per unit volume is then the value of the force per area divided by the thickness.

Table 4-5: Body load types.
Load Type	variable	SI unit	Geometric Entity Level	Space Dimension (components)
Force per reference volume	fV	N/m3	domains	3D (x, y, z) 2D (x, y) 1D (x) 2D axisymmetric (r, z) 1D axisymmetric (r)
Force per deformed volume	fv	N/m3	domains	3D (x, y, z) 2D (x, y) 1D (x) 2D axisymmetric (r, z) 1D axisymmetric (r)
Force per reference area	fA	N/m2	domains	2D (x, y)
Force per deformed area	fa	N/m2	domains	2D (x, y)
Total force	Ftot	N	domains	3D (x, y, z) 2D (x, y) 1D (x) 2D axisymmetric (r, z) 1D axisymmetric (r)

Linear Buckling

To display this section, click the button (

) and select in the dialog.

If you are performing a linear buckling analysis with a combination of live and dead loads, select the checkbox to indicate that the load contributions from this node are constant. The default is that a load is proportional to the load factor.


	For more information about live and dead loads, see Buckling Analysis.

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You can add the Phase subnode to specify the phase of this load in a frequency domain analysis.

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You can specify this load to be a Harmonic Perturbation in a frequency domain analysis.

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You can assign this load to a load group. See Load Cases in the Structural Mechanics Modeling chapter.

Location in User Interface

Context Menus

Ribbon

Physics tab with or selected:

Ribbon

Physics tab with or selected: