The Equiangle Skewness is represented as the maximum ratio of the cell's included angle to the angle of an equilateral element. The angle skewness applies to all cell types and is available for domains and blocks. The angle skewness varies between 0 (good) and 1 (bad). It is recommended this skewness measure be kept below 0.8 for a good grid; values below 0.9 are acceptable, depending on the solver.


Note: For FLUENT® users, the Equiangle Skewness is directly comparable to FLUENT®'s own skewness criteria. Checking this diagnostic before export can help you catch any mesh problems before they crop up in your solution.

The Equiangle Skewness is computed as follows:

The Examine Task: Functions, Computing Equiangle Skewness


Qmax = largest angle in cell, in degrees
Qmin = smallest angle in cell, in degrees
Qe = angle for equilateral element (i.e. 60 for triangle, 90 for quad, etc.)

The Equiangle function is based on Fluent®'s equiangle grid quality criteria.