Efficiency of fluid-structure interaction simulations with adaptive underrelaxation and multigrid acceleration

Yigit Yigit,Schäfer Schäfer,Sternel Sternel

doi:10.1260/175095407780130535

Abstract

In the present paper the efficiency of acceleration techniques for fluid- structure interaction computations are investigated. The solution procedure involves the finite volume flow solver FASTEST, the finite- element structural solver FEAP, and the coupling interface MpCCI. Within the employed partitioned solution approach, a geometric multigrid solution strategy on moving grids for the fluid domain is introduced. In particular, the order in which the convective fluxes have to be treated within the pressure- correction smoothing procedure is addressed. For reducing the coupling iteration steps an adaptive underrelaxaation algorithm is employed. Both acceleration techniques are investigated separately and in combination with respect to numerical efficiency. As test configuration a representative three-dimensional ullsteady coupled problem is considered.

Highlights

Coupled fluid solid problems usually require a high computational effort
The present paper extends these studies by employing a multigrid method and investigating the combined acceleration
7 CONCLUSION An adaptive underrelaxation approach and a multigrid algorithm on moving meshes have been studied with respect to their capabilities to reduce the cormputing tirmes for fully coupled fluid-structure interaction computations

Summary

Introduction

Coupled fluid solid problems usually require a high computational effort. Especially in threedimensional cases the computation time for the fluid part often increases dramatically with the number of unknowns when applying simple iterative solution algorithms.Within the frame of a partitioned approach, on the one hand, both solution algorithms for the fluid and structure problems may be irmproved and, on the other hand, the coupling strategy can be optirnized.In the present investigation a multigrid procedure for moving meshes together with an adaptive underrelaxation strategy is applied for accelerating the coupled computations. Coupled fluid solid problems usually require a high computational effort. Within the frame of a partitioned approach, on the one hand, both solution algorithms for the fluid and structure problems may be irmproved and, on the other hand, the coupling strategy can be optirnized. In the present investigation a multigrid procedure for moving meshes together with an adaptive underrelaxation strategy is applied for accelerating the coupled computations. A few investigations concerning the efficiency of adaptive coupling schellles have been presented in earlier works. In [15] modified Aitken-like methods are investigated including a study of their speed-up behavior. The works concentrate on the investigation of the adaptive coupling procedure. The present paper extends these studies by employing a multigrid method and investigating the combined acceleration

Methods

Results

Conclusion