Akkerman, I.

Hosseini Zahraei, S. M.

Huijsmans, R. H. M.

Veldman, A. E. P.

English

The concept of fluid-structure interaction(FSI) has a vast range of practical engineering applications. Since the analytical solution for such a systems is not available, numerical methods are adopted. Two main approaches are monolithic and partitioned methods. Treating the coupled system of fluid and structure simultaneously as in monolithic approach will limit the flexibility, in the other hand this property is maintained by decomposing the physical system into fluid and structure. Using a partitioned approach, the solution is separately advanced in time over each partition. Interaction effects are accounted for by transmission and synchronization of coupled state variables. The strength of the coupling is traditionally maintained by correcting the interaction effects iteratively. Besides convergence’s high computational cost, the physics of the interaction can also jeopardize an iterative procedure. For two-way physically coupled systems the information exchange among two partitions (fluid and structure) is relaxed to avoid numerical instabilities. In this paper, the idea of preserving coupling strength by catching the presence of the structure through an interaction law is studied and formulated. The structural modal representation is utilized to derive the interaction boundary at the fluid-structure interface. Since this approach strongly enforces the information exchange on the fluid-structure interface, the source of instabilities is abolished. As a test case, a 1D Euler-Bernoulli beamlocated at the bottom of a 2D tank is strongly coupled with a fluid above by means of iterative under-relaxed coupling results and also the weak coupling. The results are shown and then discussed

Proceedings - University of Groningen

On the elastic beam-fluid intreaction based on structural mode shapes

https://pure.rug.nl/ws/files/65792218/ICHD2016_Matin.pdf

On the elastic beam-fluid intreaction based on structural mode shapes

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Proceedings - University of Groningen