Cubit 16.04 User Documentation
The metrics used for wedge elements in CUBIT are summarized in the following table:
Function Name
|
Dimension
|
Full Range
|
Acceptable Range
|
Aspect Ratio
|
L^0
|
1 to inf
|
1 to 3
|
Element Volume
|
L^3
|
-inf to inf
|
None
|
| Condition No |
L^0
|
1 to inf
|
1 to 3
|
Jacobian
|
L^3
|
-inf to inf
|
None
|
Scaled Jacobian
|
L^0
|
-1 to 1
|
0.2 to 1
|
Shape
|
L^0
|
0 to 1
|
0.2 to 1
|
| Distortion |
L^0
|
-1 to 1
|
0.6 to 1
|
With a few exceptions, as noted below, Cubit supports quality metric calculations for linear wedge elements only. When calculating quality metrics, that only support linear elements, for a higher order wedge element, Cubit will only use the corner nodes of the element.
Aspect Ratio: Maximum edge length ratios at the wedge center
Element Volume: Calculated by dividing the wedge into 11 tetrahedron and summing the volume of each.
Condition No.: Condition number of the Jacobian matrix at any corner
Jacobian: Minimum pointwise volume at any corner. Cubit also supports Jacobian calculations for Wedge21elements.
Scaled Jacobian: For linear elements the minimum Jacobian divided by the lengths of 3 edge vectors
Shape: 3/Mean Ratio of weighted Jacobian Matrix
Distortion: {min(|J|)/actual volume}*parent volume