The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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ON THE ELASTIC MEMBRANE-FLUID INTERACTION BASED ON STRUCTURAL MODES SHAPES


Go-down ichd2016 Tracking Number 50

Presentation:
Session: Fluid structural inter-actions I
Room: Room 4
Session start: 10:30 Mon 19 Sep 2016

Seyed Matin Hosseini Zahraei   s.hosseinizahraei@tudelft.nl
Affifliation: PhD Candidate

Ido Akkerman   i.akkerman@tudelft.nl
Affifliation: Assistant Professor

Arthur Veldman   a.e.p.veldman@rug.nl
Affifliation: Professor

Rene Huijsmans   R.H.M.Huijsmans@tudelft.nl
Affifliation: Professor


Topics: - Fluid-structural interactions and hydroelasticity

Abstract:

The concept of FSI has a vast range of practical engineering applications. Different approaches like weak coupling which utilizes the flexibility or strong coupling which exploit mathematical advantages has been introduced and implemented. On the other hand, several have come up with the idea of catching the presence of the structure through an interaction law which if it is well defined could lead to a hybrid method preserving advantages of both weak and strong couplings. Weak coupling in contrary to its simplicity faces limitations such as the added mass ratio which as it increases, numerical instabilities will occur which could be prohibited by under relaxation at the cost of extra structure-fluid iterations or it could also broke down the coupling if it exceeds one. This will lead to an inefficient way to solve such a coupled systems, therefore a well-known challenge in computing fluid structure interaction in complex systems is to provide an effective interaction law. In this paper a structure shape mode based interaction law has been introduced and formulated. Shape modes of the structure represent a proper general behavior of the object. The approach strongly enforces the information exchange on the fluid-structure interface which leads not to be dependent on the added mass ratio. This paper also presents the first test model case which is selected to be a 1D Euler-Bernoulli beam at the bottom of a basin with an oscillating square shaped object within the fluid which will excite the beam modes dependent on its own motion frequency. The results are shown and then discussed.