Numerical computation of the three-dimensional turbulent flow in siphon outlet conduit of large pumping stations

With the finite volume method and unstructured grid, the RNG κe turbulence model is adopted to close the steady uncompressible Reynolds time-averaged NS equations, and the interior 3D flow field of a siphon outlet conduit under designed discharge is numerically simulated. On the basis of computational results, comprehensive analysis of the interior flow patterns of the siphon outlet conduit is made, the velocity distribution characteristics of siphon crest and outlet cross-sections are analyzed. The head loss and drag coefficient of the siphon outlet conduit is 0.204 m and 3188×10~(-3), respectively, and the velocity distribution coefficients of the two cross-sections mentioned above are 73.9% and 65.4%, respectively. The prediction of hydraulic characteristics of siphon outlet conduit is realized. It provides references for the optimization of the conduit hydraulic design and model test research.