Add Green function based on uniform pressure

[RShaw026]

Description and Context

This merge request adds the option to use a Green function based on uniform pressure on the grids. Earlier, the influence coefficients were calculated based on the point forces at the center of the grids. Now, the influence coefficients are calculated based on a uniform pressure on grids. This is expected to increase the accuracy of the results.

This work is based on Pohrt and Li (2014). https://doi.org/10.1134/S1029959914040109

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How Has This Been Tested?

The results with the pressure-based Green function are closer to the analytical solution than the results with the point-force-based Green function.

Checklist

• [ ] My commit messages mention the appropriate GitHub issue numbers and are longer than one line where appropriate.
• [ ] I have added/updated documentation where necessary.

Additional Information

Interested Parties / Possible Reviewers

@isteinbrecher @mayrmt

[RShaw026]

@isteinbrecher Hi Ivo. Can you please review this merge request? It would be better to set up the test cases for HPC implementation with the pressure-based green function.