The following sections in the Settings windows for the nonlocal coupling nodes are similar or the same for some of the nonlocal coupling nodes and are described in this section.

Enter a name for the operator in the Operator name field or use the default name. This is the name that is used to access the operator in the model, so use a name that describes it well. For example, genext1 is the default name for the first General Extrusion coupling operator, and you can use it to evaluate a temperature T in the destination using genext1(T), for example.

From the Geometric entity level list, select Domain, Boundary, Edge (3D only), or Point. Select Manual, All domains, All boundaries, All edges, or All points from the Selection list. If Manual is selected, select geometric entities in the Graphics window. Select All domains, for example, to add all applicable geometry to the Selection list.

Click the Active button to activate one of the vertex selections. You can toggle between turning ON and OFF selections.

Select a single source vertex for each of Source vertex 1, Source vertex 2, Source vertex 3, and Source vertex 4. Then select a single destination vertex for each of Destination vertex 1, Destination vertex 2, Destination vertex 3, and Destination vertex 4 (vertex 4 is available for Linear Extrusion only).

An evaluation point in the destination geometry is first orthogonally projected onto the linear space spanned by the destination vertices (unless they span the entire space). The projected point is then mapped to the source geometry by a linear mapping taking each destination vertex to the corresponding source vertex. Let L be the line through this point, which is parallel to a line through the first and last source vertices. If the source selection lies in the linear space spanned by the source vertices, the Linear Projection operator is evaluated by integrating along L. In general, the operator is evaluated by integrating along the line or curve in the source selection, which is mapped to L under orthogonal projection onto the linear space spanned by the source vertices.

Select Manual or All boundaries from the Selection list to define the source selection. If Manual is selected, select boundaries in the Graphics window. Select All boundaries to add all boundaries to the Selection list.

There can only be one destination boundary. Click the Active button to enable or disable the Destination Boundary selection. Then choose the boundary in the Graphics window.

Select a Source frame to use in the source. In most cases the Source section default settings can be used. Optionally, select the Use source map check box and enter expressions in the x-expression, y-expression, and z-expression fields (in 3D) for the source map from the source to the intermediate mesh.

For the General Extrusion nonlocal coupling, the number of source map expressions is the same as the number of destination map expressions. With the default source map expressions, the intermediate mesh can be considered identical to the source.

The dimensionality idim of the intermediate space is determined by the number of nonempty source and destination map expressions, which must be the same, and must also satisfy srcedim ≤ idim ≤ srcsdim, where srcedim is the dimension of the source selection, and srcsdim is the dimension of the source geometry.

For the General Extrusion, Linear Extrusion, Boundary Similarity, and Identity Mapping nonlocal couplings, select an option from the Mesh search method list to specify what should happen if an evaluation point in the destination is mapped to a point outside the source:

Enter a scalar positive value in the Extrapolation tolerance field. If the mapped point is within a distance of the extrapolation tolerance times the mesh element size, the point is considered to be in the source. Otherwise, the mapping fails.

Select the Use NaN when mapping fails check box to evaluate the operator to NaN (Not-a-Number) if the mapping fails. Otherwise, an error occurs.

For the Integration couplings, select Integration or Summation over nodes from the Method list. In most cases use integration. Summation over nodes is useful, for example, for calculating reaction forces.

If Integration is selected, enter a value in the Integration order field (see integration order in the Glossary). Also, when working with multiple frames, select a Frame from the list for the volume element to be used in the integration.

For axisymmetric geometries, the Compute integral in revolved geometry check box is selected by default to perform the integration in 3D (for a 2D axisymmetric model) or in 2D (for a 1D axisymmetric model).

For Integration and Average operators, when the model includes an extra dimension geometry, select the Evaluate in extra dimension check box. When selected, for an Integration operator, the integration operator becomes an integration over base dimension operation. It computes the integration over the source selection for evaluation in each coordinate of an extra dimension geometry. The operator is the counterpart to the Integration Over Extra Dimension operator that you can add under Definitions>Extra Dimension for an Extra Dimension node. Here it represents the integration over the extra dimension’s source selection for evaluation in each coordinate of a base geometry (a geometry under a normal component). Similarly for an Average operator, it computes the average over the base geometry’s source selection for evaluation in each coordinate of an extra dimension geometry. The counterpart, Average Over Extra Dimension, can be found under Definitions>Extra Dimension for an Extra Dimension node. It computes the average over the extra dimension’s source selection for evaluation in each coordinate of the base geometry.