Methodology for Comparing Coupling Algorithms for Fluid-Structure Interaction Problems

Jason P. Sheldon, Scott T. Miller, Jonathan S. Pitt

Applied Research Laboratory, The Pennsylvania State University, State College, USA.

DOI: 10.4236/wjm.2014.42007                

Abstract

The multi-physics simulation of coupled fluid-structure interaction problems, with disjoint fluid and solid domains, requires one to choose a method for enforcing the fluid-structure coupling at the interface between solid and fluid. While it is common knowledge that the choice of coupling technique can be very problem dependent, there exists no satisfactory coupling comparison methodology that allows for conclusions to be drawn with respect to the comparison of computational cost and solution accuracy for a given scenario. In this work, we develop a computational framework where all aspects of the computation can be held constant, save for the method in which the coupled nature of the fluid-structure equations is enforced. To enable a fair comparison of coupling methods, all simulations presented in this work are implemented within a single numerical framework within the deal.ii [1] finite element library. We have chosen the two-dimensional benchmark test problem of Turek and Hron [2] as an example to examine the relative accuracy of the coupling methods studied; however, the comparison technique is equally applicable to more complex problems. We show that for the specific case considered herein the monolithic approach outperforms partitioned and quasi-direct methods; however, this result is problem dependent and we discuss computational and modeling aspects which may affect other comparison studies.

Keywords

Fluid-Structure Interaction; FSI; Finite Element Method; Monolithic Coupling; Partitioned Coupling; Dirichlet-Neumann Coupling; Multi-Physics

Conflicts of Interest

The authors declare no conflicts of interest.

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