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The implement and influence of different boundary conditions in direct simulation on particle sedimentation

Liu Han-Tao Chang Jian-Zhong

The implement and influence of different boundary conditions in direct simulation on particle sedimentation

Liu Han-Tao, Chang Jian-Zhong
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  • Received Date:  16 November 2012
  • Accepted Date:  07 December 2012
  • Published Online:  05 April 2013

The implement and influence of different boundary conditions in direct simulation on particle sedimentation

  • 1. School of Mechatronice Engineering of North University of China, Taiyuan 030051, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 50976108) and the Fund for International Joint Research Program of Shanxi Province, China (Grant No. 2011081040).

Abstract: In this paper, we present a direct numerical simulation of particle sedimentation in two-phase flow with four different boundary conditions. We demonstrate that different boundary conditions can result in quite different flow behaviors. Some interesting results are obtained. By redefining the computational domain at each time step according to the position of the particle, we construct an infinite channel, which can simulate the particle sedimentation accurately; the flow pattern of periodic boundary is quite different from the infinite channel because of the disturbed flow field; if the settlement is reached steadily before the closed bottom, the closed channel can also simulate the particle settled in the infinite channel; the fluidized condition slows down the particle sedimentation, which is very helpful for better using the boundary conditions.

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