A Numerical Method for Transient Tracking of Sediment Particles in Dredge Pump

A Numerical Method for Transient Tracking of Sediment Particles in Dredge Pump

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In order to transiently solve the transient edgewater shoes movement of sediment particles in dredge pumps, a modified algorithm is realized based on the discrete phase model in ANSYS Fluent.The granular phase volume fraction solved by using the Eulerian (granular)-Eulerian (liquid) two phases flow method and the Huilin-Gidaspow drag force laws are introduced for tracking particles with the Lagrangian method in dense flow.The solution process that solves particle motion after updating the impeller grid is changed to a process that solves particle relative motion after rotating synchronously the impeller grid with the particles.Under the situations of beetroot birkenstock moving wall, the modified algorithm avoids the calculation error on collision identification and rebounded velocity of the particles.

A comparison of numerical results shows that the modified algorithm can significantly improve the accuracy of particle motions in the dredge pump with similar time cost.The erosive wear predicted by the modified algorithm mainly appears on the front edges of the blades and the peak of erosion rate is about 7×10-5 kg/(m2∙s), which is similar to the actual situations, supporting the effectiveness of the modified algorithm.