During the OpenMDAO workshop in 2022 it has been mentioned that someone did some work on the analytic (or algorithmic?) derivatives for a Boundary Element Method solver, for the use in gradient-based optimisations, and would be willing to share. Is there any reference to that work?
All the workshop presentations and contact information will be posted on the OpenMDAO website by mid November 2022. Keep an eye out here for when that is posted.