The Electromechanical Forces coupling feature applies the material and underlying free space contributions to the stress as a body load. In weak form: .
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The Electromechanical Forces coupling feature applies the above defined traction as a boundary load on the boundaries which are external for the coupling feature selection but internal for the corresponding Electrostatics interface.
COMSOL Multiphysics does not explicitly include the ambient pressure definition on the Electromechanical Forces coupling feature. However, it is possible to add an additional surface force to the corresponding Solid Mechanics interface if the pressure is known or computed by another physics interface.
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COMSOL Multiphysics provides a choice of the electromagnetic stress model, which is available in the Electromechanical Forces coupling feature. Any of the above presented three options can be selected; the default choice is the Minkowski stress tensor.
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