| Fluid-structure interaction (FSI) is one of the most challenging research issues in academic and engineering fields. The researching vibration of FSI can void the resonance induced by the structure and fluid coupling. Non-linear flow coupling problem is the academic and engineering the most challenging part of the study. The introduction of modern numerical methods, accurate simulation of complex flow convection flows and market structure vibration and the impact of the unsteady flow on the structure of incentives, to avoid the fluid-induced resonance structure so as to enhance the reliability and safety of structures is important. Francis turbine wheels are moving parts, but also the core of the turbine components, when the vortex-shedding frequency and the natural frequency was close resonance happened. Therefore, the turbine runner parts of fluid-solid coupling calculation for the understanding of hydraulic vibration mechanism to prevent the hydraulic resonance, to ensure safe and stable operation of generating units is of great significance. This paper is based on a different solving model for iterative fluid coupling, and its main concert of the following:(1) This paper achieved synchronized strong coupling iterative way and compared with results calculated with weak coupling iterative way in order to get the superiority of respective coupled iterative way.(2) k-εmodel for fluid were used for incentive vibration research of plate under the spoiler of oval. LES model was used for the research that vortex shedding from the fixed vanes induced vibration for the guide vanes.(3) The entire flow coupling with leaves, and monitoring the vibration of various points on leaves were used for analyzing the flow of the turbulent situation, its deformation, the runner leaves vibration and vibration greater value to forecast hydraulic un-stability phenomenon.(4) In the small flow case, it was to analysis the flow in the draft tube and observed the evolution of vortex zone with time.
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