The Component Definition subnode under
Reduced Flexible Components is used for selecting the domains that form a reduced component. By default, a number of
Component Definition nodes are automatically generated when a selection is made in the parent node. Each
Component Definition node then contains a selection of domains that form a contiguous object, based on an analysis of the geometry.
You can modify the initial automatic selections, and add or remove Component Definition nodes as needed. To make manual selections possible, you must set
Component Definition to
User defined in the parent node.
The Component Definition node is only available with some COMSOL products (see
https://www.comsol.com/products/specifications/).
Select the Number of eigenmodes to be used when building this reduced component. The default is
From parent. Select
User defined to enter another value.
Physics tab with Reduced Flexible Components node selected in the model tree: