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• W2971345650 abstract "In this thesis 3D free surface flow in the rectangular pump sump has been simulated numerically using the FLOW3-D Software. The present numerical model used solves the Reynolds Averaged Navier-Stokes (RANS) equations and VOF multiphase model. The K-e RNG turbulence model and the GMRES algorithm for pressure-velocity coupling are used. To study the sensitivity of the discretization of flow field, three types of grid with different cell numbers has been used and similar results were achieved in the last two grid and the results were independent from the grid. in the validation of this numerical model, emphasis was placed on the prediction of the number, location, size and strength of the various type of vortices. For this purpose Results of the numerical simulation of a benchmark model has been compared with data available in the literature and the results have been verified. Free surface and sub-surface vortices have been visualized using the Q-criterion and effect of the eccentricity of the suction pipe on the vortical structures has been investigated. In order to quantitative analysis of the results, circulation and aslo the overal rotation angle at different slices along the suction pipe are computed by integrating the vorticity field over the slices area and variations of these parameters along the pipe are investigated. After detection of the vortical structures in the base model, effect of the various anti-vortex devices (AVDs) such as side and corner fillets, bed splitter and curtain wall on the control of the free surface and sub-surface vortices has been studied. Results show that the basin with the side and corner fillets which are designed according to the ANSI9.8 recommended sizes, results in better hydrodynamic conditions compared to the basin with bigger side filletes. In the basin equiped with the big side filletes, despite the suppresion of the side sub-surface vortices, development of the new sub-surface vortices at the back of the suction pipe induces more complexity to the flow inside of the suction pipe and consequently the rotation of the flow at the slices along the suction pipe increases. The free surface vortices cause low frequency fluctuations at the pump inlet. The curtain wall controls the free surface vortices and it eliminates the low frequency- high amplitude fluctuations at the pump inlet. Based on the parametric studies, the optimum distance of the curtain wall from the suction pipe is determined 2.1D, where D is the pipe diameter. Finally a new geometry for the pump basin is recommended, which suppresses all of the free surface and sub-surface vortices." @default.
• W2971345650 created "2019-09-05" @default.
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• W2971345650 date "2016-01-01" @default.
• W2971345650 modified "2023-09-24" @default.
• W2971345650 title "Numerical Study of Vortex Control in Pump Intakes" @default.
• W2971345650 hasPublicationYear "2016" @default.
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