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


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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journal="Journal of Zhejiang University Science A",
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T1 - Large eddy simulation of the gas-particle turbulent wake flow
A1 - LUO Kun
A1 - JIN Han-hui
A1 - FAN Jian-ren
A1 - CEN Ke-fa
J0 - Journal of Zhejiang University Science A
VL - 5
IS - 1
SP - 106
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2004.0106

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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[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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