SPHinXsys provides C++ APIs for engineering simulation and optimization. It aims at complex systems driven by fluid, structure, multi-body dynamics and beyond. The multi-physics library is based on a unique and unified computational framework by which strong coupling has been achieved for all involved physics.
https://github.com/Xiangyu-Hu/SPHinXsys/blob/8d5a76089aedb3ce0d61a224b3858b85436c431c/SPHINXsys/src/shared/particle_dynamics/general_dynamics/general_interpolation.cpp#L52
@Xiangyu-Hu This is why the electromechanics case was failing It had dW_ijVj instead of Wij