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The Comparison of Two Coupling Approaches on the Analysis of Two-way Fluid-solid Interaction

Author: WuYunFeng
Tutor: CuiYuHong
School: Tianjin University
Course: Solid Mechanics
Keywords: fluid-solid interaction ANSYS+FLUENT UDF ANSYS+CFX square- hole scaffold
CLC: O359
Type: Master's thesis
Year: 2009
Downloads: 449
Quote: 5
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Abstract


The studies on fluid-solid interaction play an important part in the aviation, aerospace, water conservancy, construction, petroleum, chemical, marine and biological fields. For example, the effect of liquid sloshing on the stability of the rocket flight, the fluid-solid interaction of a large reservoir under seismic excitation, the impact of liquid turbulent vibration on the pipe infusion. With the continuous development of science and technology, the fluid-solid interaction methods become mature and perfect, so an increasing number of researchers pay more attention to the the studies of fluid-solid interaction.Considering the previous case of finite deformation in the calculation of certain models, which the grids have some serious damage and distortion in the use of ANSYS + FLUENT method and the calculation can not be converged. On this basis the article makes an reasonable solution, that is, through writing the UDF procedures for the use of dynamic grid, to achieve ANSYS + FLUENT solution under steady-state conditions. Furthermore, ANSYS + CFX coupled method is also used for solving steady-state, and two ways are used to compare the results for the same simulation in different parameters conditions.Calculation results show that the case of low Reynolds number, between the two methods and the theoretical formula has a very small difference. As the Reynolds number increasesing, when the grids of model are refined and convergence accuracy is improved, the calculation accuracy is improved apparently. In the condition of small deformation and finite deformation, it can be seen in the two methods that the grid size, grid quality and accuracy have a significant impact on the calculation results.At last, parts of the square hole models are calculated, found that between fluid-solid coupling and non-fluid-solid coupling have very large differencs, and the porosity and pore radius have greatly effected on the calculated results.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Multiphase flow
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