Application of two-phase smoothed particle hydrodynamics method to dam break over movable bed

doi:10.7523/j.issn.2095-6134.2017.05.013

Abstract

Abstract: Smoothed particle hydrodynamics (SPH) method adopts discrete particles for discretion of computational domain,and field variables and their spatial derivatives are evaluated by summation interpolation based on particle and kernel functions,which makes this method more suitable for processing the large displacement,movable boundary,and free surface problems.In order to analyze the dam break problem over movable bed,an erosion condition based on Drunker-Prager is used.The particles satisfying this condition will move with the non-Newtonian characteristic,i.e.,Herschel-Bulkley-Papanastasiou rheology,while the particles which do not satisfy the condition will remain still.In order to improve the results of numerical modelling further,a two-phase SPH method which is based on the ratio of volume is applied when modelling the dynamics of mixture,and the calculation of viscosity of mixture is improved based on the dynamic characters of solid-fluid mixture.A dam-break problem over movable bed is analyzed based on the model mentioned above.Numerical results are compared with the experimental data,and the comparison verifies that the proposed formula improves the results of numerical modelling.

Key words: smoothed particle hydrodynamics, movable bed, dam break, two-phase, non-Newtonian fluid

CLC Number:

TU443

QIAO Cheng, PAN Huali, OU Guoqiang. Application of two-phase smoothed particle hydrodynamics method to dam break over movable bed[J]. , 2017, 34(5): 625-632.

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