[crimsoncabbages]

Does anyone know what the ICEM quality paramater which is simply
known as "Quality" actually represents?

[Gweher]

You could find the answer in the ICEM Help manual:

Originally Posted by ICEM CFD Manual

ICEM CFD Quality:
The ICEM CFD quality measure calculates element quality based on the quality values in ANSYS ICEM CFD. This measure is only available for cells and not faces.

Tetrahedra: The quality is calculated as the skewness of the tetrahedral element.

The remaining quality values are based on various quality metrics computed in ANSYS ICEM CFD.

Hexahedra: The quality is based on the Determinant, Max Orthogls, and Max Warpgls metrics in ANSYS ICEM CFD.

The determinant is the ratio of the smallest and the largest determinant of the Jacobian matrices, where a Jacobian matrix is computed at each node of the element.

The max orthogls metric calculates the maximum deviation of the internal angles of the element from 90 degrees. Angles between 180 and 360 degrees (deviation up to 270 degrees) will also be considered.

The warp for each face is calculated as the maximum angle between the triangles connected at the diagonals of the face. The max warpgls metric is calculated as the maximum warp of the faces comprising the element.

These values are normalized and the minimum value of the three normalized diagnostics will be used.

Pyramids: The quality is based on the Determinant computed in ANSYS ICEM CFD.

The determinant is the ratio of the smallest and the largest determinant of the Jacobian matrices, where a Jacobian matrix is computed at each node of the element.

Prisms: The quality is based on the Determinant and Warp computed in ANSYS ICEM CFD.

The determinant is the ratio of the smallest and the largest determinant of the Jacobian matrices, where a Jacobian matrix is computed at each node of the element.

The warp for each face is calculated as the maximum angle between the respective edges and a plane containing the mid-points of the edges comprising the face. The warp for the element is then calculated as the maximum warp of the faces comprising the element.

The quality is calculated as the minimum of the determinant and warp.

For further details on the quality measures available in ANSYS ICEM CFD, refer to the ANSYS ICEM CFD Help Manual.

The range of quality values reported is between 0-2 (the range in ANSYS ICEM CFD is -1 to 1, and a value of 2 corresponds to -1 in ANSYS ICEM CFD, 1 to 0, and 0 to 1, respectively).A value of 0 indicates a perfect, non-distorted element, 1 indicates a degenerate element, and values above 1 indicate an invalid (e.g., concave, dihedral angle > 180 degree, or negative volume) element