Accuracy and performance of fluid-structure interaction algorithms with explicit versus implicit formulations of the fluid solver

Fluid structure interaction (FSI) describes a problem when a solid structure deforms or oscillates by the in uence of the fluid flow, and thus a two-way interaction occur, such as in wind turbines, airfoils, parachutes, biological systems, including aneurysms, etc. One of the major challenges in the numerical simulation of this problem is the computational cost, and most of the current solvers are using an implicit method for fluid, with Newton-Raphson method being the most popular. However, an explicit method is relatively cheap. In this paper, explicit method with sub-iterations is compared with a Newton-Raphson method through an FSI benchmark case. We concentrate on comparison of accuracy as well as the computational performance of the two methods.