To compute the sum of the reaction forces over a region, use Volume Integration, Surface Integration, or Line Integration under Results>Derived Values. The integration method discovers that the reaction forces are discrete values and applies a summation instead of an integration.
If you create an integration operator under Component>Definitions>Nonlocal Couplings>Integration to sum reaction forces, you must explicitly set Method to Summation over nodes.
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Derived Values, Evaluation Groups, and Tables in the COMSOL Multiphysics Reference Manual
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