COMSOL 6.4 - Intersection

) node, in the toolbar, from the (

) menu, select . You can also right-click the node to add this node from the submenu. Then enter the properties of the intersection operation using the following section:

From the list, choose (default) to select the geometry objects that you want to intersect 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.

Select the checkbox to use the selected geometry objects for further geometry operations.

To create a geometry object without interior boundaries, clear the checkbox. This can be useful to simplify a geometry where the interior boundaries do not separate domains with different physics nodes or materials, for example.

The checkbox is cleared by default, which means that a geometric entity that was created by the intersection operation is removed if its dimension is less than the dimensions of the input entities it originates from. Select this checkbox to keep also such lower-dimensional entities (for example, an edge resulting from the intersection of two faces).

You can change the settings for the list if you experience problems with the intersection operation. Geometric entities that have a distance less than the repair tolerance are merged.

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The default value in the list is , which for 3D objects represented using the CAD kernel determines the repair tolerance internally. For 3D objects represented using the COMSOL kernel, and for 2D and 1D objects, means a relative repair tolerance of 10−6.

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Choose to enter a value for the field (the default is determined by the main node’s setting). This value is relative to the largest absolute value of the coordinates of all input objects.

When you build this feature, the relative and absolute repair tolerances are set to the values that are used (with a precision of two digits), which can be useful when you have set to .

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 ( if in a geometry part; in a plane geometry under a work plane in a 3D component) 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 a color for highlighting the resulting objects selection. See Selection Colors.

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).

If you have Named Selections that include entities on the input objects, select the (selected by default) checkbox to update the selections to corresponding entities on the output objects, when possible. Clear the checkbox to not propagate the selection to the resulting objects. This can be useful in combination with selecting the checkbox so that the selections refer only to the input objects.

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.