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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.1 P.106~110

http://doi.org/10.1631/jzus.2004.0106


Large eddy simulation of the gas-particle turbulent wake flow


Author(s):  LUO Kun, JIN Han-hui, FAN Jian-ren, CEN Ke-fa

Affiliation(s):  Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   fanjr@mail.hz.zj.cn

Key Words:  Large eddy simulation, Plane wake, Coherent structures, Particle dispersion


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LUO Kun, JIN Han-hui, FAN Jian-ren, CEN Ke-fa. Large eddy simulation of the gas-particle turbulent wake flow[J]. Journal of Zhejiang University Science A, 2004, 5(1): 106~110.

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author="LUO Kun, JIN Han-hui, FAN Jian-ren, CEN Ke-fa",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2004.0106"
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%DOI 10.1631/jzus.2004.0106

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T1 - Large eddy simulation of the gas-particle turbulent wake flow
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A1 - CEN Ke-fa
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VL - 5
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EP - 110
%@ 1869-1951
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2004.0106


Abstract: 
To find out the detailed characteristics of the coherent structures and associated particle dispersion in free shear flow, large eddy simulation method was adopted to investigate a two-dimensional particle-laden wake flow. The well-known Sub-grid Scale mode introduced by Smagorinsky was employed to simulate the gas flow field and Lagrangian approach was used to trace the particles. The results showed that the typical large-scale vortex structures exhibit a stable counter rotating arrangement of opposite sign, and alternately form from the near wall region, shed and move towards the downstream positions of the wake with the development of the flow. For particle dispersion, the Stokes number of particles is a key parameter. At the Stokes numbers of 1.4 and 3.8 the particles concentrate highly in the outer boundary regions. While the particles congregate densely in the vortex core regions at the Stokes number of 0.15, and the particles at Stokes number of 15 assemble in the vortex braid regions and the rib regions between the adjoining vortex structures.

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Reference

[1] Fan, J. R., Zheng, Y. Q., Yao, J. and Cen, K. F., 2001. Direct simulation of particle dispersion in a three-dimensional temporal mixing layer. Proc R Soc Lond A, 457:2151-2166.

[2] Jin, H. H., Luo, K., Fan, J. R. and Cen, K. F., 2002. Large eddy simulation of a particle-laden turbulent plane jet. Journal of Zhejiang University Science, 3(4):57-62.

[3] Orlanski, I., 1976.A simple boundary condition for unbounded hyperbolic flows. Journal of Computational Physics, 21:251-269.

[4] Smagorinsky, J., 1963. General circulation experiments with the primitive equations. I. The basic experiment. Mon. Weather Rev., 91(3):99-164.

[5] Tang, L., Wen, F., Yang, Y., Crowe, C.T., Chung, J. N. and Troutt, T. R., 1992. Self-organizing particle dispersion mechanism in a plane wake. Phys. Fluids A, 4(10):2244-2251.

[6] Yang,Y.,Crowe,C.T.,Chung,J.N. and Troutt,T.R, 2000. Experiments on particledispersion in a plane wake. Int. Journal of Multiphase Flow, 26:1583-1607.

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