Adding volume dependency for actuator regions

[lamkina]

Purpose

This PR adds a volume dependency to actuator regions. Previously, the actuator region volume was computed once during initialization and the source terms were computed using the baseline actuator region volume and baseline cell volumes. In subsequent optimization iterations with shape change, the baseline volumes were still used, resulting in an incorrect distribution of source terms in the actuator region.

With this PR, we re-compute the actuator region total volume in the metric subroutine after we update the geometry. Additionally, the sourceTerms_block subroutine in residuals.f90 was updated to depend on the current cell volumes and current actuator region total volume. I used AD to get the derivative of the actuator region total volume calculation and added the necessary mpi calls to master, master_d, and master_b to accumulate the volume seeds.

Finally, I added a new test that uses an FFD around the actuator zone pipe mesh to test the derivatives with the actuator zone volume changing. The FFD file is added to AFS and I retrained the actuator zone tests to account for the changes.

Expected time until merged

A few weeks, but hopefully sooner since this is incorrectly computing the actuator zone during optimization.

Type of change

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [ ] Maintenance update
• [ ] Other (please describe)

Testing

I added a test to the actuator region regression tests that runs the dot product test with shape variables using a simple FFD.

Checklist

• [x] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [x] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [x] I have run unit and regression tests which pass locally with my changes
• [x] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #318 (b84ab84) into main (409b986) will increase coverage by 0.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
+ Coverage   41.87%   41.94%   +0.07%     
==========================================
  Files          13       13              
  Lines        4017     4017              
==========================================
+ Hits         1682     1685       +3     
+ Misses       2335     2332       -3     

see 1 file with indirect coverage changes

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[lamkina]

bump @anilyil @sseraj