Body Load
The Body Load nodes adds a general volumetric load to the selected domain. The feature can be used to approximate sources of complex external processes.
Force
Select a Load type — Force per unit volume, Total force, or for 2D components, Force per unit area.
Then enter values or expressions for the components in the matrix based on the selection and the space dimension. These can be general time dependent expressions or data from interpolation functions.
For Total force COMSOL Multiphysics divides the total force by the volume of the domains where the load is active. For 2D components, and if Force per unit area is selected, the body load as force per unit volume is then the value of F divided by the thickness.