COMSOL 6.2 - Initial Values (Rigid Material)

The subnode is automatically added when you select that the initial values in a Rigid Material node are .

You can enter initial values for the rigid body displacement, rotation, and velocities, which can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear analysis. The initial values that you specify are interpreted in the selected coordinate system.

Center of Rotation

Select an option from the list: , , or. The given initial values are interpreted at the center of rotation.

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For , the center of rotation is taken as the one defined in the parent node.

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For select an — , , or . The available choices depend on geometrical dimension. The initial conditions act at the centroid of the selected entities, which do not need to be related to rigid domain itself. As a special case, you can select a single point and thus prescribe the initial conditions at that point.


	When chosen, a default Center of Rotation: Boundary, Center of Rotation: Boundary, or Center of Rotation: Point subnode is automatically added.

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For , enter the , Xc, in the table.

Select the check box to add an optional offset vector to the definition of the center of rotation. Enter values for the offset vector Xoffset.

The center of rotation used is the sum of the vector obtained from any of the input methods and the offset vector.

Initial Values: Translational

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∂u/∂t.

Initial Values: Rotational

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For 3D components only: Ω

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ω (3D components) and ∂ϕ/∂t (2D components)

Location in User Interface

This node is automatically added when is selected in the section in the parent node. It cannot be added or removed manually.