Fixing triangular element interior angle quality issues

When you select the Max Included Angle (Tria) and Min Included Angle (Tria) options in the 2D Mesh dialog box, the software uses an algorithm to ensure that elements meet the criteria that you specify. This algorithm includes a combination of splitting element edges, swapping element edges, and moving nodes to fix elements with included angles that violate the specified values. This algorithm is particularly effective in complex models where you specify a very low Min Included Angle (Tria) value, such as 10, or a very high Max Included Angle (Tria) value, such as 170.

When you select these options, the software significantly improves both elements with very small included angles and elements with very large included angles compared to meshes where you do not select these options.

Note:

If the Min Included Angle (Tria) value is ≥20 and/or the Max Included Angle (Tria) value is ≤140, the software does not split elements that violate the threshold values. By not splitting the elements, the software prevents the creation of too many elements with very small and/or very large included angles.

The following graphics show the difference between a mesh created without the Min Included Angle (Tria) and Max Included Angle (Tria) options and a mesh created with them.

Mesh created with the Min Included Angle (Tria) and Max Included Angle (Tria) options turned off. The elements outlined in red have interior angle values smaller than the specified Minimum Interior Angle < value in the Element Quality dialog box.	Mesh created with the Min Included Angle (Tria) and Max Included Angle (Tria) options selected. All elements are now within the specified minimum and maximum interior angle values in the Element Quality dialog box.

As a best practice, you should consider the overall complexity of your model when you specify element quality threshold values. In general, you can specify more aggressive quality values when your model is simpler, while you should specify more conservative values when your model is complex.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed part
Command Finder	2D Mesh
Location in dialog box	Mesh Quality Options group

How do I

Create a 2D free mesh

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Using pre-defined favorite settings to create 2D meshes

Understanding the 2D meshing methods

Quadrilateral only meshing

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Midnode placement for parabolic elements

Creating a separate mesh for each face or polygon body

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Fixing triangular element interior angle quality issues, Simcenter 3D 2021.1 Series

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