# Skewness angle

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 June 17, 2006, 10:16 Skewness angle #1 chris Guest   Posts: n/a Hello everybody, what is the commen definition of a skewness angle of a tetrahedron? I looked for this for hours and can't find an answer. Thanks for reading, Chris

 June 20, 2006, 21:28 Re: Skewness angle #2 khai ching Guest   Posts: n/a For 2D Tria, the property that might grasp our interest is the skewness angle, defined by HM: skew in Trias is calculated by finding the min. angle between the vector from each point (of the Tria) to the opposing mid-side and the vector between the two adjacent mid-sides at each point of the Tria. For 3D Tetra, volumetric skew is important, defined by HM: A sphere through the four nodes of the tetra is created. That sphere defines an ideally shaped equilateral tetra, in which its volume is defined as: 8r^3/(9*sqrt(3)). The actual volume of the tetra element is then determined. The Tetra's volumetric skew is then written as: Volumetric skew =( Videal-Vactual)/Videal Hope that helps. -khai ching-

 June 21, 2006, 08:09 Re: Skewness angle #3 chris Guest   Posts: n/a Ok, so I guess the term "Skewness angle" does not exist. I am examining a volumetric grid in Gridgen with that "Skewness - min ang"-Function and wonder which angles are meant. The overall average of those angles is around 45°.

 June 21, 2006, 08:15 Re: Skewness angle #4 O. Guest   Posts: n/a probably the angle between two adjacent edges, or the angle between an edge and the two faces it is not part of ...

 June 24, 2006, 14:36 Re: Skewness angle #5 John Chawner Guest   Posts: n/a Chris, I suggest that you contact a technical support engineer at support@pointwise.com and they will be able to tell you exactly how that skewness measure is calculated.

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