Partitioned block-Gauss-Seidel coupling for dynamic fluid-structure interaction

This paper presents a fully coupled three-dimensional solver for the analysis of time-dependent fluid-structure interaction A partitioned time marching algorithm is employed for the solution of the time dependent coupled discretised problem enabling the use of highly developed robust and well-tested solvers for each field Conservative transfer of information at the fluid-structure interface is combined with an effective block-Gauss-Seidel iterative scheme to enable implicit coupling of the interacting fields at each time increment The three-dimensional unsteady incompressible fluid is solved using a powerful implicit dual time stepping technique with explicit multi-stage Runga-Kutta time stepping in pseudo-time and an ALE formulation for moving boundaries A finite element dynamic analysis of the highly deformable structure is carried out with a numerical strategy combining the implicit Newmark time integration algorithm with a Newton-Raphson second-order optimisation method Test cases are presented to benchmark the algorithm and to demonstrate the potential applications of this method (C) 2008 Elsevier Ltd All rights reserved