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If Automatic is selected, the center of rotation is determined as the average position of the selected points.
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For Centroid of selected entities, select an Entity level — Domain, Boundary, Edge, or Point. The available choices depend on physics interface and geometrical dimension. The center of rotation is located at the centroid of the selected entities, which do not need to be related to the points used for computing the average rotation. As a special case, you can select a single point, and thus use that point as center of rotation.
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Once chosen, a default Center of Rotation: Domain, Center of Rotation: Boundary, Center of Rotation: Edge, or Center of Rotation: Point subnode is automatically added.
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When User defined is selected, enter the location of the center of rotation manually.
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Use two different study steps. In the first step, do not solve for the average rotation variables. This can be done by disabling the Average Rotation node in the study settings. In the second study step, solve only for those variables by disabling the other dependent variables under the Dependent Variables node.
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A similar approach is to use a separate study, rather than a study step, for computing the average rotation. The main difference is that you manually have to connect the two studies using the Values of Dependent Variables section of the second study.
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Use a segregated solver. In this case, solve for the average rotation variables only in the last segregated step. Note that in the default case, always at least two iterations will be performed in a segregated solver. This is typically not what you want. Set Termination technique to Iterations in the Segregated node, and terminate after one iteration. Then, if required, set up the Segregated Step in which the structural mechanics problem is solved so that proper nonlinear iterations are performed until convergence.
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