NUMERICAL SIMULATION OF FREE SURFACE MUDFLOW USING INCOMPRESSIBLE SPH

10.22099/ijstc.2013.940

Abstract

In this paper, Incompressible SPH (ISPH) is used to simulate free-surface mudflow for two case studies, including dambreak and flow under a gate. The mixture of water and sediment in mudflow is treated as a non-Newtonian fluid. Mass and momentum conservation equations in a 2-D  Lagrangian  frame,  along  with  the  Herschel-Bulkley  rheology  model,  were  solved  to  simulate mudflow  using  ISPH.  Further,  a  Large  Eddy  Simulation  (LES)  model  was  used  to  evaluate  the effect  of  turbulence  on  the  free  surface  flow  for  these  cases.  The  divergence-free  velocity projection  method  was  applied  to  enforce  incompressibility  of  SPH.  The  results  of  the  ISPH modeling  compared  well  with  experimental  data  and  FVM-VOF  results.  The  capability  of  the ISPH Lagrangian numerical model to capture large deformations makes it a powerful and efficient method for simulating mudflow case studies. 

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