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Control of the fluctuation in the uniform granular flow by a random force field

Su Tao Feng Yao-Dong Zhao Hong-Wu Huang De-Cai Sun Gang

Control of the fluctuation in the uniform granular flow by a random force field

Su Tao, Feng Yao-Dong, Zhao Hong-Wu, Huang De-Cai, Sun Gang
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  • Abstract views:  784
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Publishing process
  • Received Date:  09 April 2013
  • Accepted Date:  26 April 2013
  • Published Online:  05 August 2013

Control of the fluctuation in the uniform granular flow by a random force field

  • 1. Key Laboratory of Soft Matter Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
  • 2. Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant No. 2009CB930800) and the National Natural Science Foundation of China (Grant Nos. 10875166, 11274355).

Abstract: A normal distribution random force field is introduced into the study of granular flow, and its effect is observed by computer simulations. The results show that the random force almost does not cause changes in average density and velocity in a uniform granular flow, and affects little the fluctuation of the density. The main effect of the random force field is that it increases the fluctuation of the granular velocity and maintains the granular flow at a certain dispersed kinetic energy by competing with the dissipation of the granular system. It is also shown that the dispersed kinetic energy obtained by the random force field is not equally distributed in each degree of freedom, and that the equipartition of energy is difficult to realize in granular system because of its dissipation property.

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