Grid Utility Functions for Unstructured Grid Conversion into CPG format

[arturcastiel]

Grid Utility Functions for Unstructured Grid Conversion into CPG format

Summary

This pull request introduces a set of utility functions in the GridUtil namespace to facilitate unstructured grid indexing and conversion from an unstructured mesh representation to a corner-point grid (CPG) format. The key functions include:

• pillar_to_flat_array(pillar): Flattens a pillar-based coordinate representation into a linear array.
• convertUnsToCPG(coord_uns, element, nx, ny, nz): Converts an unstructured mesh into a corner-point grid representation, generating coord_cpg and zcorn_cpg arrays.

Changes Introduced

• Introduced convertUnsToCPG, which processes an unstructured mesh into a corner-point grid representation by:
  • Extracting pillar coordinates.
  • Mapping mesh elements to pillar-based coordinates.
  • Computing zcorn indices and assembling the final arrays.

Motivation

This implementation is necessary to convert the LGR refined coordinates given in a Unstructured Grid structured into CPG structure as required by the OUTPUT file format.

[arturcastiel]

jenkins build this please

[arturcastiel]

jenkins build this please