Electrostatic Force Computation with Boundary Element Methods

. Boundary element methods are a well-established technique for solving linear boundary value problems for electrostatic potentials. In this context we present a novel way to approximate the forces exerted by electrostatic fields on conducting objects. Like the standard post-processing technique employing surface integrals derived from the Maxwell stress tensor the new approach solely relies on surface integrals, but, compared to the former, offers better accuracy and faster convergence. The new formulas arise from the interpretation of forces fields as shape derivatives, in the spirit of the virtual work principle, combined with the adjoint approach from shape optimization. In contrast to standard formulas, they meet the continuity and smoothing requirements of abstract duality arguments, which supply a rigorous underpinning for their observed superior performance. 2020 Mathematics Subject Classification. 65N38, 78M15, 45A05. Abstract. Boundary element methods are a well-established technique for solving bound- ary value problems for electrostatic potentials. In this context we present a novel way to ap- proximate the forces exerted by fi elds on conducting objects. Like the standard post-processing technique employing surface integrals derived from the Maxwell stress tensor the new approach solely relies on surface integrals, but, compared to the former, o ff ers better accuracy and faster convergence. The new formulas arise from the interpretation of forces fi elds as shape derivatives, in the spirit of the virtual work principle, combined with the adjoint from shape optimiza-