Antisymmetry BC with surface-piercing topology

[gawng]

Purpose

This needs more test cases before it is ready for merging.

The antisymmetry BC is appropriate for high-speed foils near the free surface for modelling the loss of lift and increase in drag. This PR contains the antisymmetry option that works for surface-piercing topology (e.g., a strut).

Expected time until merged

Summer 2024

Type of change

• 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

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.57%. Comparing base (20ff867) to head (5a52fd0).

❗ There is a different number of reports uploaded between BASE (20ff867) and HEAD (5a52fd0). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (20ff867)	HEAD (5a52fd0)
	8	4

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #287       +/-   ##
===========================================
- Coverage   41.02%   27.57%   -13.45%     
===========================================
  Files          13       13               
  Lines        4119     4119               
===========================================
- Hits         1690     1136      -554     
- Misses       2429     2983      +554     

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