Comparative Analysis of Computational Methods in Fluid-Structure Interaction: Temporal discretization and coupling techniques

摘要

Fluid-structure interaction problems occur in a wide variety of science and engineering fields. In solving such problems, two domains of different characteristics shall be modeled and analyzed through separate kinematic equations. The complexity in the computation of such kind of problems arise mainly from the modeling and analysis of the problem at the interface. Thus, the interfacing condition is also treated as an independent part. A range of computational techniques based on spatial and temporal discretization schemes have been proposed and being employed in solving diverse FSI problems. Monolithic and partitioned approaches are the two broad classes of FSI numerical analysis approaches under the temporal discretization scheme. The monolithic approach requires development of complex mathematical model to represent the whole FSI domain collectively. The partitioned approach, unlike the monolithic approach, make good use of the existing developed and advanced tools with segregate analysis. Nevertheless, the latter requires an additional external code for coupling at the interface. Based on the behavior of the coupling conditions at the interface, FSI computational methods are also categorized under either one-way or two-way coupled approaches. Moreover, the formulation scheme chosen to describe mesh motions, spatial discretization and more other approaches determine classification schemes of FSI solution techniques. In line with the broader classifications based on temporal discretization and coupling schemes, simulation results on a benchmark problem employing selected computational approaches have been analyzed and discussed. Results from a strongly coupled two-way partitioned approach, from an open source code, is compared against one-way coupled partitioned approach utilizing ANSYS code (academic research mechanical). The strongly coupled portioned approach shows a more realistic result than the one-way coupled system.