An accelerated, fully-coupled, parallel 3D hybrid finite-volume fluid-structure interaction scheme

作者：Malan A G^*; Oxtoby O F

来源：Computer Methods in Applied Mechanics and Engineering, 2013, 253: 426-438.

DOI：10.1016/j.cma.2012.09.004

• 3D fluid-structure interaction
• Vertex-centred finite volume
• Partitioned strongly coupled
• Implicit
• Parallel

In this paper we propose a fast, parallel 3D, fully-coupled partitioned hybrid-unstructured finite volume fluid-structure-interaction (FSI) scheme. Spatial discretisation is effected via a vertex-centred finite volume method, where a hybrid nodal-elemental strain procedure is employed for the solid in the interest of accuracy. For the incompressible fluid, a split-step algorithm is presented which allows the entire fluid-solid system to be solved in a fully-implicit yet matrix-free manner. The algorithm combines a preconditioned GMRES solver for implicit integration of pressures with dual-timestepping on the momentum equations, thereby allowing strong coupling of the system to occur through the inner solver iterations. Further acceleration is provided at little additional cost by applying LU-SGS relaxation to the viscous and advective terms. The solver is parallelised for distributed-memory systems using MPI and its scaling efficiency evaluated. The developed modelling technology is evaluated by application to two 3D FSI problems. The advanced matrix-free solvers achieve reductions in overall CPU time of up to 50 times, while preserving close to linear parallel computing scaling using up to 128 CPUs for the problems considered.

• 出版日期2013-1-1