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flow choking over weir flow slit-type flip buckets

Journal of Hydrodynamics 2015年第6期27卷 907-912页

作者：马飞徐准吴建华 College of Water Conservancy and Hydropower Engineering Hohai University

The flow choking may occur for weir flow slit-type flip buckets trader common operation conditions. An estimation method is developed through introducing a comprehensive coefficient to determine the approach flow Froude number for the flow choking to occur in those flip buckets. The error of the present method relative to the experimental data is less than 5%. The results show that, the Froude number for the flow choking to occur is related to the contraction ratio and the contraction angle of the flip buckets. When the flow choking occurs, the upper jet trajectory decreases and the lower one is almost not affected, and the dynamic pressures on the bottom and the sidewalls increase due to the flow profile rising on the flip buckets.

关键词： flow choking jet trajectory dynamic pressure slit-type flip bucket weir flow

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Simulation of open channel flows by an explicit incompressible mesh-free method

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Journal of Hydrodynamics 2023年第2期35卷 287-298页

作者： Zhi-jian Huang Ti-bing Xu David Z.Zhu Song-da Zhang School of Civil and Environmental Engineering and Geography Science Ningbo UniversityNingbo315211China Department of Civil and Environmental Engineering University of AlbertaAlbertaCanada Ningbo River Management Center Ningbo315303China

In this study,to simulate open channel flows,an explicit incompressible mesh-free method is employed in which the pressure field is obtained by explicitly solving the pressure Poisson *** capture the velocity information in open channel flows,the source term in the pressure Poisson equation is modified while the spatial discretization of gradient and Laplacian models is based on the moving particle semi-implicit(MPS)*** inflow boundary condition is treated by injecting fluid particles into the domain according to the inlet discharge,and the outflow condition is handled by prescribing the pressure distribution and removing the fluid particles beyond the *** explicit incompressible mesh-free method is then used to simulate open channel flows,including weir flow,hydraulic jump,and flow over an *** the simulations,velocity distribution and flow pattern are *** simulated results are compared to available experimental measurements and other numerical *** is a good agreement between the simulated results and the experimental *** shows that the explicit incompressible mesh-free method can reproduce the flow characteristics in the open channel flows.

关键词： Mesh-free method explicit scheme weir flow hydraulic jump velocity distribution

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