COMSOL 6.2 - Corner Refinement

) attribute to decrease the element size at sharp corners, as shown to the right in Figure 8-44. The node considers a vertex in 2D or an edge in 3D to be a sharp corner if the angle between the adjacent selected boundaries, with respect to the selected domain, is greater than a specified angle.

Figure 8-44: The default tetrahedral mesh for this backstep geometry (left). The image to the right shows how the tetrahedral mesh is refined close to the sharp corner when a Corner Refinement node has been added.

To add a (

) node, select boundaries in the graphics, then choose one of the following:

•

Right-click a mesh operation and choose (

) to add it as a local attribute.

To add it as a global node in the meshing sequence:

•

In The Mesh Toolbar, choose from the (

) menu.

•

Right-click the node and choose (


	Global vs. Local Attributes


	If there are several Corner Refinement nodes in the sequence with a nonempty selection intersection, the mesh generator uses properties corresponding to the last Corner Refinement node in the sequence.

Then enter the properties using the following sections:

Domain Selection

Specify the domains for which the node determines if the specified corners are sharp. Choose the level of the geometry from the list:

•

Choose to specify that the attribute determines sharp corners with respect to all domains. The corner refinement also considers corners not adjacent to any domain.

•

Choose to specify the domains for which you want to determine sharp corners. Choose in the list to select the domains in the window, choose a named selection to refer to a previously defined selection, or choose to select all domains.

By default, Domain Selections are (the button is ON).

Boundary Selection

To specify the boundaries, click the button to turn it ON and select the boundaries in the window for which the corner refinement determines the sharp corners. When the boundary selection is , the section button is automatically turned OFF.

Angle

Use the field to specify the minimum angle between a pair of adjacent boundaries in the boundary selection for the refinement factor to apply at the vertex in 2D and edge(s) in 3D between the two boundaries. If a boundary pair is adjacent to one domain on each side (interior boundary) the corner refinement determines the angle(s) on the side(s) corresponding to the specified domain(s).

Select the check box (default off) and the settings in the section to filter out a selection of the automatic selection of corners.

Filter Corner Selection


	This section is only available when the Filter corners check box is selected.

Use these settings to specify corners to include or exclude from the automatic selection of corners. Choose in the list and click the button to turn it ON to select the entities in the window or from the Selection List, choose a named selection to refer to a previously defined selection, or choose or to select all edges or points, respectively. This is useful when another handling of a selection of sharp corners is specified in Corner Properties attributes.

Refinement

Use the field to specify a refinement factor (<1) that scales the element size for the vertices in 2D and edges in 3D corresponding to the sharp corners.

For tutorials using , see:

•

Boundary Layer Meshing — Exploring the Settings:
Application Library path .

•

Micromixer: Application Library path .

•

Bimetallic Strip in Airflow: Application Library path .