Numerical study on instantaneous discharge of unsorted particle

Jie Gu, Chi Wai Li, Hong Yang, Yong Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The mixing characteristics of particles such as dredged sediment of variable size discharged into cross flow are studied by a 3D numerical model, which is developed to model the particle-fluid two-phase flow. The Eulerian method with the modified k-ε parameterization of turbulence for the fluid phase is used to solve fluid phase, while a Lagrangian method for the solid phase (particles), both the processes are coupled through the momentum sources. In the model the wake turbulence induced by particles has been included as additional source term in the k-ε model; and the variable drift velocities of the particles are treated efficiently by the Lagrangian method in which the particles are tracked explicitly and the diffusion process is approximated by a random walk model. The hydrodynamic behavior of dumping a cloud of particles is governed by the total buoyancy of the cloud, the drag force on each particle and the velocity of cross-flow. The computed results show a roughly linear relationship between the displacement of the frontal position and the longitudinal width of the particle cloud. The particle size in the cloud and the velocity of cross flow dominate the flow behavior. The computed results are compared with the results of laboratory experiments and satisfactory agreement is obtained.
Original languageEnglish
Pages (from-to)305-316
Number of pages12
JournalChina Ocean Engineering
Volume21
Issue number2
Publication statusPublished - 1 Jun 2007

Keywords

  • 3D numerical model
  • Cross flow
  • Eulerian-Lagrangian method
  • Instantaneous discharge
  • Particle cloud
  • Two-phase flow

ASJC Scopus subject areas

  • Water Science and Technology
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Ocean Engineering

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