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[FAQ]

Skewness is a key quality standard to confirm mesh qualities. Its definition is almost the same as the quality confirmation type in GAMBIT, Equi Size Skew. You can also check this with Fluent and select Equi Size Skew (cell value) in the Contour panel. The skewness in ANSYS Meshing evaluates to what extent the edge and angle of the created mesh deviates from the ideal state (equilateral triangle / square) and is defined as follows.
•(Ideal Cell Size – Created Cell Size) ÷ Ideal Cell Size
oIdeal cell size = equilateral cell size with radius of the same circumcircle oApplies to triangular and tetrahedral meshes
•max[(θmax – θe) / (180 – θe), (θe – θmin) / θe] oθmax = face’s or cell’s maximum angle oθmin = face’s or cell’s minimum angle
oθe = face’s or cell’s ideal angle (equiangle—equilateral triangle: 60 degrees, square: 90 degrees)
oApplies to all mesh types oSame defining formula as Equi Size Skew in GAMBIT