Rotating Frame

Centrifugal, Coriolis, and Euler forces are “fictitious” volume forces that need to be introduced in a rotating frame of reference, since it is not an inertial system. Use a node to add the effect of these forces. The forces are generated by all selected features in the physics interface having a density, mass, or mass distribution. You select objects having the highest geometrical dimension of the interface, and all objects with a lower dimensionality which belong to the selection are automatically included.

The node is only available with some COMSOL products (see http://www.comsol.com/products/specifications/).

This section is only present in the in the Layered Shell interface, where it is described in the documentation for the Rotating Frame node.

Select an — , , , or . For enter a rbp and eax.

Select a — or . The rotational direction does not make any difference for a centrifugal force.

Select a — , or . Then enter a value as needed for Ω , or .

For 3D and 2D components, use the or check boxes to determine which effects of a rotating frame that are to be incorporated in the analysis. Only is selected by default.

For 2D axisymmetric components, the only effect from a rotating frame is the centrifugal force, which is then always included.

The check box is selected by default. When including spin-softening effects, an extra contribution to the centrifugal force from deformation is taken into account. The check box is only available if or is selected.

	Rotating Frame and Gravity

	Only features which have a geometrical selection contribute to the mass forces. The Mass and Moment of Inertia nodes are global features and will not get any contribution from Rotating Frame.

	You can assign this load to a load group. See Load Cases in the Structural Mechanics Modeling chapter.

Physics tab with or selected:

Physics tab with , , or selected:

Physics tab with selected:

Physics tab with or selected: