On the turbulent boundary layer of a rapid-flowing dry granular matter down an incline: Theory and numerical simulations

C. Fang, W. Wu

研究成果: Conference contribution

摘要

The characteristics of the turbulent boundary and passive layers of an isothermal, rapid-flowing dry granular matter with incompressible solid grains are studied by a zero-order turbulent closure model. To this end, the thermodynamic analysis, based on Mueller-Liu entropy principle, is conducted to derive the equilibrium closure relations satisfying turbulence realizability conditions, with the dynamic responses of postulated by a nonlinear theory with respect to two-fold granular coldnesses. The closure model is applied to analysis of an isothermal, stationary dry granular avalanche down an incline. While the mean velocity and volume fraction increases/decreases from their minimum/maximum values on the plane toward the maximum/minimum values on the free surface exponentially, two-fold turbulent kinetic energies and dissipations evolve in a reverse manner. Most two-fold turbulent kinetic energies and dissipations are confined within the turbulent boundary layer immediately above the plane, with nearly vanishing and finite values on the free surface in the passive layer, respectively. These characteristics demonstrate a similarity to that of conventional Newtonian fluids in turbulent boundary layer flows. The turbulent boundary and passive layers are better verified by the distributions of the turbulent kinetic energy and dissipation.

原文English
主出版物標題Computer Methods and Recent Advances in Geomechanics - Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
發行者Taylor and Francis - Balkema
頁面1849-1856
頁數8
ISBN(列印)9781138001480
出版狀態Published - 2015 一月 1
事件14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 - Kyoto, Japan
持續時間: 2014 九月 222014 九月 25

出版系列

名字Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014

Other

Other14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
國家/地區Japan
城市Kyoto
期間14-09-2214-09-25

All Science Journal Classification (ASJC) codes

  • 電腦科學應用
  • 地球化學與岩石學

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