Fillet mesh controls

Use the Fillet type of Mesh Control to produce a structured mesh of elements along the length of a fillet, blend, or rounded surface. You can create Fillet type mesh controls to ensure that the software produces more uniform, regular elements along fillets or blends in your model prior to 2D or 3D meshing.

Selecting fillets for mesh control creation

There are several different ways to select the fillet surfaces on which to create a Mesh Control. You can:

• Interactively select the surfaces within the part from the graphics window.

• Use the Fillet Faces option on the Top Border bar, together with specific criteria in the Smart Selector Options dialog box to select cylindrical surfaces.

• Use the Faces by Group option on the Top Border bar to select cylindrical surfaces in an existing group.

• Use the Filter option in the Mesh Control dialog box, together with Fillet Selection Parameters that you specify, such as the maximum and minimum radii.Note: If you use the Filter option, the software continues to evaluate the selected target geometry during meshing. In some cases, the automatic abstraction process that occurs during meshing can result in either additional or fewer fillet surfaces that meet the defined criteria for the mesh control.

Specifying the fillet selection parameters

If you select the Filter check box in the Mesh Control dialog box, you can use the Fillet Selection Criteria to specify the criteria to use to select appropriate fillets or blends within the selected target geometry.

• Use the Minimum Radius and Maximum Radius options to define the selection criteria for fillet radii.

• Use the Minimum Angle and Maximum Angle options to define the selection criteria for fillet angles. A fillet’s angle is the angle between the faces that the fillet connects.

• Use the Type list to select the type of fillets that you want the software to select. You can select convex fillets that have an Outside Radius (1), concave fillets that have an Inside Radius, or you can use the All Types option to have the software search simultaneously for both types of fillets.

Use the Preview Fillets option to view the fillets that the software identifies based on your specified criteria.

Defining the mesh parameters for fillet surfaces

A Fillet mesh control helps you to control the distribution of elements along a fillet’s axis (1) and around its circumference (2). The axial direction can be thought of as the lofted or swept direction of the fillet.

Use the Along Axis options to control the size of the elements along the length of the fillet:

• If you select By Size, you specify the element size to use along the length of the fillet.

• If you select None, the software uses the overall element size for the 2D or 3D mesh as the element size along the length of the fillet.

Use the On Circumference options to control the size of the elements around the circumference of the fillet.

• If you select By Size, you specify the element size. The software creates a minimum of 2 elements in the fillet’s arc, provided that the elements are not smaller than the specified Minimum Size.

• If you select By Angle, you specify the number of elements to create for every 90º segment of the fillet.

• If you select None, the software uses the overall element size of the 2D or 3D mesh.

You can also use the Minimum Size value to specify a minimum size for the elements around the circumference of the fillet. The software will try to not produce any elements with edges smaller than this specified value.

Using the Aspect Ratio setting

Use the Aspect Ratio option to specify a maximum aspect ratio value. The aspect ratio measures the ratio of an element's length to its width. If a mesh control causes the software to produce an element that violates the specified Aspect Ratio value, the software reduces the element sizes in the mesh control.

Understanding when the software honors a Fillet mesh control

The software tries to honor the specifications of a Fillet type of mesh control when you generate a quadrilateral or triangular 2D mesh on a fillet surface and do not select the CAD Curvature Abstraction check box. The software generates elements based on the element size or number of elements and the Aspect Ratio that you specify as long as these values do not conflict. If they do conflict, the software may modify the element size or number of elements along the fillet's axis or circumference.

Note:

The software tries to honor Fillet mesh control specifications during 3D tetrahedral meshing or during 2D meshing when the CAD Curvature Abstraction check box is selected, however it may not be able to generate the elements as specified in all cases.

Managing fillet mesh controls from the Simulation Navigator

After you create a Fillet type of Mesh Control, the software stores the information as a new Fillet Density entry in the Mesh Controls node in the Simulation Navigator. You can use right-click menu options to modify, delete, rename, or list information on a selected fillet density.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed part
Command Finder	Mesh Control
Menu	Insert→Mesh→Mesh Control

Learn more

Controlling local mesh density (Mesh Controls)

Mesh control definitions

Number and Size on Edge mesh controls

Chordal Tolerance on Edge mesh controls

Biasing on Edge mesh controls

Size on Face mesh controls

Weld Row mesh controls

Mapped Hole mesh controls

Cylinder mesh controls

Point mesh controls

Bounding volume mesh controls

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

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Fillet mesh controls, Simcenter 3D 2021.1 Series

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