Skewness Of Mesh Structures In ANSYS® Meshing(Illustrated Expression)

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There are a bunch of mesh metric options are available in ANSYS® to assess the mesh situation in various ways. One of these ways is the ‘Skewness’ value of mesh structure in ANSYS®. ‘Skewness’ value is a very important parameter to assess the mesh structure’s quality. In this article, we will explain;

  • What is the ‘Skewness’ in ANSYS® Meshing?
  • How can we see the ‘Skewness’ of mesh structures in ANSYS®?

What Is ‘Skewness’ Mesh Metric In ANSYS® Meshing?

Select the ‘Skewness’ from ‘Mesh Metric’ in ANSYS® Meshing.

To see the skewness of the created mesh structure in ANSYS® Meshing, click on the ‘Mesh’ tab as in the green box above then select the ‘Skewness’ as shown in the red box above at the pop-up menu of ‘Mesh Metric’ in ‘Statistics’ as shown by the green arrow.

Skewness numerical values in ANSYS® Mesh metric.

You can see the numerical values such as minimum, maximum average, and standard deviation of ‘Skewness’ of mesh elements in ANSYS®. Also, you can see the dispersion of various skewness values belongs to the various numbers of mesh elements in the graph above.

Skewness is actually directly related to the quality of mesh structure. Unlike other mesh metric options in ANSYS® Meshing, skewness directly shows how many the mesh structure is close to its ideal shape or form. The examples below shows this situation for skewness value in ANSYS® Meshing.

Skewed mesh structures for triangular and quadrilateral shapes.

As you can see above that the ideal form of triangular mesh structure is an equilateral triangle in terms of skewness. Also, equiangular quad elements are preferable in terms of skewness in ANSYS® Meshing again.

Skewness and the mesh quality table.

The table above shows the quality mean of various skewness values. According to the above chart about skewness values, when the skewness is getting small, this means higher element quality.

Conclusion

Skewness is the major element quality factor that is being used in meshing structures in ANSYS®. the expression of ‘Skewness’ can be made like above. Leave your comments and questions about the ‘Skewness and mesh cells in ANSYS® Meshing’ below!

NOTE: All the screenshots and images are used in education and informative purposes. Images used courtesy of ANSYS, Inc.

Image source: ANSYS® Meshing User’s Guide

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