COMSOL 6.2 - Union

Union

Unite imported 3D surface meshes with each other. The operation will partition geometric entities and intersect mesh elements where the meshes intersect.

Syntax

model.component(<ctag>).mesh(<tag>).create(<ftag>,"Union");

model.component(<ctag>).mesh(<tag>).feature(<ftag>).selection();

model.component(<ctag>).mesh(<tag>).feature(<ftag>).selection(property);

model.component(<ctag>).mesh(<tag>).feature(<ftag>).set(property,<value>);

model.component(<ctag>).mesh(<tag>).feature(<ftag>).getType(property);

Description

Use model.component(<ctag>).mesh(<tag>).create(<ftag>,"Union") to unite meshed entities in 3D. Supported input: entire geometry, unmeshed domains, boundaries adjacent to unmeshed domains, isolated boundaries, isolated edges, and isolated points.


	Use feature.selection() when dimension is 1, 2, or 3. Use feature(<ftag>).selection(property) when dimension is mixed.

Use DeleteEntities to delete domain elements while keeping the unmeshed domains. If a subset of the faces are selected for the operation, it might not be possible to update any existing domain information. Use CreateDomains to recreate the domains, if needed, FreeTri to remesh faces, and then FreeTet to generate a tetrahedral mesh in the domains.

The following properties are available:

Table 4-42: Available Properties.
Property	Value	Default	Description
abstol	double		Absolute point snapping tolerance, if toltype is absolute.
cleanup	on \| off	on	Cleanup of the mesh before and after uniting the selected entities, for example by collapsing small and sliver elements.
dimension	1 \| 2 \| 3 \| all \| mixed	all	Specifies the entity dimension to be united. Default is entire geometry.
domain			Specifies the domain selection if dimension is mixed.
edge			Specifies the edge selection if dimension is mixed.
face			Specifies the face selection if dimension is mixed.
placement	linear \| curved	curved	Specifies the placement of mesh vertices in the intersection between united entities.
reltol	double	0.001	Relative point snapping tolerance, if toltype is relative.
toltype	auto \| relative \| absolute	auto	How the snapping tolerance is specified.
vertex			Specifies the vertex selection if dimension is mixed.