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Global coordinate system (the default)
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Global coordinate system (the default)
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Boundary System (a predefined normal-tangential coordinate system)
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Global coordinate system (the standard global coordinate system).
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Local edge system (the default).
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Global coordinate system (the default)
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Free (the default) to leave the rotations unconstrained.
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Rotation to activate a prescribed rotation in a direction. Enter a value or expression for the prescribed rotation θ in each row for the local tangential directions t1 and t2. Under For small strains, select one or both of the Free rotation around t1 direction and Free rotation around t2 direction check boxes to remove the constraint for the corresponding rotation component. If unchecked, the rotations are constrained to either the input value or to the default zero rotation. The status of the check boxes has no effect when the geometric nonlinearity is activated under the study settings. This is because the constraints put on different rotation components are not independent of each other in case of finite rotations.
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In 2D axisymmetry, there is only one input, the Prescribed rotation around the out-of-plane direction, Θ.
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Normal vector to describe the rotational degrees of freedom as a prescribed normal vector. Enter the components of the Prescribed normal vector N0.
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) and select Advanced Physics Options in the Show More Options dialog box.
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In the COMSOL Multiphysics Reference Manual:
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When Individual dependent variables is selected in the Apply reaction terms on drop-down list, the constraint forces are applied directly on the degrees of freedom, which are the displacements along the global coordinate axes. If you use this setting together with a local coordinate system, the results will be inconsistent since the constraint forces will not match the constraint orientation.
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