Boundary Load
Use a Boundary Load to apply tractions or pressure to boundaries.
Force
Select a Load type — Force per unit area, Pressure, Total force, or for 2D components, Force per unit length. Then enter values or expressions for the components in the force vector based on the space dimension.
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For Force per unit length, the boundary load as force per unit area is the value of F divided by the thickness.
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For Total force, COMSOL Multiphysics divides the total force by the area of the surfaces where the load is active.
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For Pressure, a scalar input is given, and the orientation of the load is given by the normal to the boundary. The pressure is positive when directed toward the solid. In a geometrically nonlinear analysis, the current surface normal and area are used.