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The shape with negative pressure gradient (NPG) is the necessary condition that can ensure vehicle moving in water not to separate. Separation and cavitation characters of shape U-1 with NPG were simulated, and the results were compared with the Nesteruk's experimentation data. According to the potential theory, two different aerofoils with NPG were designed. Considering different angle of attack...
Approximately two-thirds of heart valves are bileaf plane mechanical heart valves, however the plane valveleaf is not the best shape for the hydrodynamic characteristics. The main purpose of this study is to compare the hydrodynamic characteristics of plane valve with curved valve under the steady flow analysis. In this work, two styles of curved valves were designed and nine different 3D flow models...
This study presents the direct numerical simulations (DNS) of bubbly wake flows. The DNS with Lagrangian particle dynamics (LPD) model is applied to the cases of bubble dispersion over a cylinder and a hydrofoil. The model validation is performed on the experimental data for the bubble behaviour in the wake of a circular cylinder. It is confirmed that the simulated distributions of bubble stream agree...
This paper proposes a model of dam-breach problems for Tangjiashan quake lake which had been threatening to breach its dam and wash away people downstream. The proposed model utilizes the theories of flow dynamics and overflowing dam-break to solve the issues of discharge and expansion of the crevasse, and evolution of the dam-breach flow. The simulation results show that our model can perform close...
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