COMSOL 6.4 - Knit to Solid

To knit surface objects to form solid objects, from the toolbar, (

) menu, select (

).

Select the objects to knit together in the window. They appear in the list.

From the list, choose (default) to select the objects you want to knit together in the window. Click the button to toggle between turning ON

and OFF

the selections. Alternatively, choose to select all objects or choose to automatically select all objects that have not been marked as Construction Geometry. If the geometry sequence includes user-defined selections above the node, these will also be available in the list.

The knitting merges edges that have a distance smaller than the and deletes gaps and spikes smaller than the . If the checkbox is selected the operation attempts to generate new faces to replace missing geometry.

The input surface objects must have manifold topology, and the operation can only form solids with manifold topology. An example of a solid object with nonmanifold topology is a solid that has an interior surface that separates two domains. A surface object that contains an edge that is adjacent to more than one boundary is an example of a surface object with nonmanifold topology.

If you want to make the resulting entities contribute to a cumulative selection, select a cumulative selection from the list (the default, , gives no contribution), or click the button to create a new cumulative selection (see Cumulative Selections in the COMSOL Multiphysics Reference Manual).

Select the checkbox to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the resulting objects consist of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the list: , , , , or . The default is , which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose . These selections do not appear as separate selection nodes in the model tree. Select to not make any selection available outside of the geometry sequence.

From the list choose to make the resulting objects available only in the feature’s geometry sequence. The default option means that the resulting objects become construction geometry if all input objects are construction geometry. Choose to never output construction geometry objects. For more information see Construction Geometry in the COMSOL Multiphysics Reference Manual.