Make Use of three-dimensional flow field turbulence numerical simulation of unsteady flow k~εturbulence model and tracking the free surface VOF method of long-distance inverted siphon. By numerical calculation of flow characteristics and pressure distribution, carried out with the model test contrast, the results were coordinate and meet the requirements of design. But vortex formed in the filling process, it is recommended to optimize the inverted siphon inlet section. The method of combining calculation and test on the long-distance inverted siphon provide the reference for the design and operation.
The unsteady flow RNG k ~ ε turbulence model and VOF Method are employed to numerically simulate 3-D flow field of diversion tunnel outlet stilling pool in Xinjiang dina river wuyi reservoir. The computational and experimental water surface elevation, pressure on the bottom and cross-sectional mean velocity of the suspended grid stilling pool are compared in well agreement. Suspended grid is used in stilling pool, the number of vortex and range are increased in the pool, and the size of the vortex is decreased along with the flow increase. The suspended grid position is determined at end of the vortex. In the suspended grid stilling pool water stability, flow regime is good.
The problem that the actual operation flow rate of inverted siphon in Xinjiang can not meet the need of the design requirement has always been discussed. After comparing Cole Brook - White Formula, Jain,A.K Formula and Hazen-Williams Formula, and taking FRP pipes as the research object, this paper attempts to make use of different formulas to calculate friction loss of inverted siphon, compare and analyze the calculation results with the measured data of years of operation. Finally, it is proved that Hazen-Williams formula has relatively higher accuracy in calculating head loss and the frictional coefficient of friction to different diameters has been obtained, which can offer reference to the inverted siphon’s engineering design of FRP pipes.
This paper simulates the characteristics of 2D U-shape bend flow using nonlinear k~ε closure turbulence model in the software CCHE2D. Furthermore, we get the pictures about transverse slope of water surface, the transverse velocity distribution and transverse section water level variation. With comparison and analysis, the numerical simulation results are agreement with the experimental data measured by De Vriend. Simulating the movement of 2D bend flow with the software CCHE, an accurate flow basic characteristic can be obtained.
The mathematical model of plane two-dimensional flow-sediment in continental sediment-laden river is established in this paper. The two-dimensional model equation is discreted with finite element method and coefficient matrix of ordinary differential equation is approximately dealt with mass-concentration principle, then solve the set of ordinary differential equations with the difference scheme which is first prediction, then correctness and iteration, the stability of this calculation process is better and the efficiency of calculation is comparatively high. The two-dimensional model is applied in numerical modeling of the flow-sediment movement of Yerqiang river middle courses, compared the numerical results with the measured data, which indicates that the numerical results are in good agreement with the measured data, which also prove the reliability and adaptability of the model and calculated method.
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