Moldflow-specific checks used to calculate element
quality for 2D and 3D elements.
Additional element checks not listed here are not part of the solver’s normal set of
checks, and therefore use HyperMesh check methods.
2D and 3D Element Checks
These checks apply to both types of elements, but when applied to 3D elements they
are generally applied to each face of the element. The value of the worst face is
reported as the 3D element’s overall quality value.
- Aspect Ratio
- Only applied to triangles, with quadrilaterals given a value
of:
- This is the same value obtained from an equilateral triangle, and is
assigned to quads to prevent HyperMesh from
misinterpreting a quad as a badly formed triangular element.
- Moldflow calculates a triangle’s aspect
ratio by squaring the longest edge of the triangle, and dividing the
result by twice the triangle’s area. 1.0 denotes a perfect equilateral
triangle.
- When applied to 3D elements, the aspect ratio is the ratio between the
longest and shortest edges of the tetrahedral element.
3D Element Only Checks
- Vol. Aspect Ratio
- Finds the perpendicular height h of each node, and then dividing the
longest edge length L by the shortest height h and multiplying by the
square root of 1.5:
This results in an equilateral tetrahedron
having a volume aspect ratio of 1.5. Non-tetrahedral elements are
assigned a value of 1.0.