Cell Quality Remediation Field Functions Reference

The following field functions are made available to the simulation when the Cell Quality Remediation model is used.


Bad Cell Indicator This field function is activated with the Cell Quality Remediation Model, and it is defined as an integer value between 0 and 3:
  • 0: The good cell has only good neighbors.
  • 1: The bad cell has good neighbors.
  • 2: The good cell has bad neighbors.
  • 3: The bad cell has no good neighbors.

Boundary Sliver Cell Indicator This field function is used to indicate cells that can be considered “boundary slivers” and hence could be removed from the solution domain without affecting the topology of the mesh. To be considered a boundary sliver, two conditions must be satisfied:
  1. All vertices of the cell must lie on a boundary.
  2. The Cell Quality must be below the specified tolerance (1e-6 by default), indicating that the cell is too flat.



The field function has an integer value of either 0 (not a boundary sliver cell) or 1 (a boundary sliver cell).

Least Squares Quality This field function is an indicator of the quality of a cell, using the physical location of a cell centroid relative to the cell centroid locations of its face-neighbors.



The field function value is based on the ratio of the maximum and minimum eigenvalue ratios of the symmetrical matrix:

M ¯ ¯ = ∑ cell faces   i n ⅆ s i ⊗ ⅆ s i | ⅆ s i | 2

where ds i represents the vector from the cell to the neighbor centroid.

The field function then evaluates the eigenvalue ratio using a Jacobi transformation. A perfect cell has a Least Squares Quality of unity. An option also exists to include the boundary faces of the cell in the computation for boundary cells.

Zero Face Area Indicator This field function has the value of unity if the area of any of the faces approaches zero; otherwise it has a value of zero. It is used to diagnose potential mesh problems.