Force Calculation (Domain)
Use the Force Calculation node to define globally available force and torque variables for the selected domains. A similar Force Calculation node is available and defined in the Electrostatics, Magnetic Fields, Magnetic and Electric Fields, Magnetic Field Formulation, and Rotating Machinery, Magnetic interfaces. A description of the generated variable is the same as in those interfaces and is described in Force Calculation. As with those features, the Split by Connectivity operation is available by right-clicking the parent node.
Force Calculation
The method used to compute forces and torques is the integration of the Maxwell stress tensor over the exterior surfaces of a set of domains.
The Force calculation method controls the variant of the Maxwell stress tensor method. When selecting Automatic (the default) the Virtual gap method is used and proper mesh suggestions are issued. When selecting No force on contact, the legacy algorithm that was present up to version 6.3 is used.
Enter a Force name to personalize the <name> suffix in variables:
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Total force is named <physicsTag>.Force<component>_<force name>
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Total torque is named <physicsTag>.Torque<component>_<force name>
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Axial torque is named <physicsTag>.Tax<component>_<force name>
where <physicsTag> is the physics tag, and <component> is each of the spatial components.
The torque and axial torque are defined using the input for the Torque axis rax and coordinates for the Torque rotation point r0.
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In 2D axisymmetry, the radial component of the total force is set to zero, as this is an intrinsic property of the used symmetry.
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Since version 6.4, the first added feature has a default name of "1" instead of "0" and the calculation method may be different. This is handled for models opened from the GUI, though it may break backward compatibility of models that are built via API code.
For more information on calculation of forces and torques, see Computing Forces and Torques.