Defining a Rule to Remove 2D Holes

You can define a rule to specify 2D holes in the geometry that you want ignored by the meshing process. 2D holes might be circular or oblong in shape. Rules for holes do not apply to holes cut by a vertex. For oblong holes, the following limitations apply:

  • Curved oblong holes are not supported.
  • Oblong holes on nonplanar surfaces might not be recognized.
  • Oblong holes crossing several surfaces with different curvatures might not be recognized.

This task shows you how to:

Before you begin: The Meshing Rules Editor or All Parameters dialog box must be open for creating or modifying a tetrahedron, surface triangle, or surface quad mesh.

Remove Circular Holes

You can define a rule to specify the minimum and maximum diameter for circular holes in the geometry that you want ignored by the meshing process.

  1. Select the Features section, and select 2D Holes as the feature type.
  2. Select Circular as the Hole type, and select Remove hole.
    The Remove Hole dialog box appears.
  3. Define the holes you want considered by the rule.
    • To specify a parameter, enter a value.
    • To remove a parameter, click the clear field icon.

    If you clear a field, no threshold value is imposed for the corresponding parameter. You can enter values for the Maximum diameter, Minimum diameter, or both.

  4. Click OK in the Remove Hole dialog box.
    The new meshing rule is displayed in the List. From the List, you can edit, remove, or deactivate the rule at any time.

All the circular holes with a diameter between the minimum diameter and the maximum diameter are ignored by the meshing process.

Remove Oblong Holes

You can define a rule to specify the minimum and maximum diameter find the minimum and maximum width for oblong holes in the geometry that you want ignored by the meshing process. Oblong holes are holes that are not perfectly circular, such as an oval. Oblong holes have a length component and a width component.

  1. Select the Features section, and select 2D Holes as the feature type.
  2. Select Oblong as the Hole type, and select Remove hole.
    The Remove Oblong Hole dialog box appears.
  3. Define the holes you want considered by the rule.
    • To specify a parameter, enter a value.
    • To remove a parameter, click the clear field icon.

    If you clear a field, no threshold value will be imposed for the corresponding parameter. You can enter values for the Maximum diameter, Minimum diameter, Maximum width, Minimum width, or any combination of these parameters.

  4. Click OK in the Remove Hole dialog box.
    The new meshing rule is displayed in the List. From the List, you can edit, remove, or deactivate the rule at any time.

All the holes with a diameter between the minimum diameter and the maximum diameter or holes with a width between the minimum width and maximum width are ignored by the meshing process.