MULTI-LEVEL AND QUASI-NEWTON ACCELERATION FOR STRONGLY COUPLED PARTITIONED FLUID-STRUCTURE INTERACTION

Two reduced order models are presented for the simulation of physically strong coupled fluid-structure interaction problem, based on computationally partitioned flow and structure solvers. The reduced order models used are a class of quasi-Newton coupling methods to obtain a stable solution and to reduce the number of subiterations. The second reduced order model is a multi-level acceleration in with coarse grid computations are performed in order to reduce computational costs. Finally an adaptive multi-level strategy is described, that contains an indicator for when to switch from coarse to fine grid level and vice versa.