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- W2904224225 abstract "In recent years the interest of numerical predictions of fluid-structure interaction hasgrown in industrial applications as well as in the research of the phenomenon due tothe increase in computational power. Numerical predictions of fluid-structure interactiontypically suffers from instability when the solid-to-fluid density ratio becomessmall. The instability issues are most severe when weak coupling, without couplingiterations within each time step, methods are used. Further, the weak couplingintroduces the so-called artificial added mass effect, that introduces an error in thecoupling.At Fraunhofer-Chalmers Centre a state-of-the-art multiphase solver, IBOFlow, anda structural solver, LaStFEM, are developed. IBOFlow handles moving boundariesusing the mirroring immersed boundary method with adaptive grid refinements.The incompressible Navier-Stokes equations together with the boundary conditionsat the structural interface are solved on a Eulerian grid using the finite volumemethod. LaStFEM solves the structural equations together with the forces actingon the structural interface on a Lagrangian grid using the finite element method.In previous work, a strong coupling, with coupling iterations within each time step,and a simple weak coupling procedure has been implemented and validated.In this thesis different weak coupling procedures are implemented, compared andanalyzed in the existing frame work. The accuracy and stability of the weak couplingalgorithms are investigated and compared to the existing strong coupling procedure.The investigation is done by the usage of three benchmarking cases: A rigid sphereattached to an undamped spring in Stokes flow, a rigid cylinder attached to a dampedspring in a laminar flow and an elastic beam attached to a rigid cylinder in a laminarflow. The temporal and spatial accuracy are both found to be of second-order. Thelowest solid-to-fluid density ratio where a stable solution was achived using a weakcoupling algorithm is well below one and much smaller than what has been foundin the literature." @default.
- W2904224225 created "2018-12-22" @default.
- W2904224225 creator A5067512169 @default.
- W2904224225 date "2018-01-01" @default.
- W2904224225 modified "2023-09-23" @default.
- W2904224225 title "Coupling algorithms for fluid structure interaction at low density ratios- Accuracy and stability analysis of weak coupling algorithms in partioned codes" @default.
- W2904224225 hasPublicationYear "2018" @default.
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