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SKEWNESS: The equilateral or equivolume skewness is non-dimensional ranging from 0 (perfect tetrahedron) to 1 (degenerate). S = ( V_opt - V ) / V_opt V_opt = 8/27 * sqrt(3) * R^3 = Perfect tetrahedron volume V = tetrahedron volume R = circumsphere radius ASPECT RATIO: Aspect ratio is non-dimensional ranging from 1 (perfect tetrahedron) to infinity (degenerate). AR = Longest Edge / Shortest Altitude DIHEDRAL ANGLE: Cosine of the dihedral angle of the tetrahedron. Smallest and largest are given. rByR: The unitized ratio of the insphere radius to the circumsphere radius of the tetrahedron. You see '-1.0' as the minimum if there are non-tetrahedral elements.
The acuSolve utility 'acuSif' (which is for Split Internal Faces) has an option to create thermal shell elements. The attached example illustrates the process from creating the base mesh in AcuConsole, using acuSif to create the thermal shells, and using Package Mesh to bring the updated mesh back toAcuConsole.