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Force and flow characteristics of an intruder immersed in 3D dense granular matter

Particuology 2022年第12期71卷 47-55页

作者： Chaofeng Zhang Xiaoyan Ye Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China and Department of Mechanics and Engineering ScienceSchool of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China

The motion of a projectile impact onto a granular target results in both the resistance force exerted on the projectile and rheology of granular media.A horizontal arrangement of cylinder quasistatically and dynamically intruding into granular media under different velocities and angles is simulated using discrete element *** distinguished drag force regimes are exhibited,including hydrostatic-like force independent of velocity,viscous force related to velocity,and inertial drag force proportional to the square of ***,the influence of penetration angles on drag force is examined for these three regimes,and a force model,which is related to penetration depth and angle,is proposed for quasi-static ***,flow characteristics of the granular media,such as velocity field,pressure field,packing fraction etc.,are traced,and a rheology model of packing fraction and inertial number is established.

关键词： Granular media Resistance force inertial number Packing fraction Oblique penetration

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Effect of particle stress tensor in simulations of dense gas-particle flows in fluidized beds

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Particuology 2018年第3期16卷 31-43页

作者： Mohammad Reza Haghgoo Donald J. Bergstrom Raymond J. Spiteri Department of Mechanical Engineering University of Saskatchewan Saskatoon SK SFN 5A9 Canada Department of Computer Science University of Saskatchewan Saskatoon. SK S7N 5C9 Canada

A two-fluid model based on the kinetic theory of granular flow for the rapid-flow regime and the Coulomb friction law for the quasi-static regime is applied to predict the hydrodynamics of dense gas-particle flow in a three-dimensional fluidized bed. Two different models for the particle stress tensor that use different constitutive equations in the elastic-inertial regime are examined to assess their ability to predict bed dynamics. To understand how particle stress models affect structural features of the flow, a quantitative analysis is performed on some important aspects of the mechanics of bubbling beds that have received relatively little attention in the literature. Accordingly, different flow regimes are identified in the context of fluidized beds through the dimensionless inertial number, and the main characteristics of each regime are discussed. In addition, how the particle stress tensor manifests itself in the bubble characteristics, natural frequency of the bed, and particle Reynolds stress are investigated, all of which help to better understand the complex dynamics of the fluidized bed. The numerical results are validated against pub- lished experimental data and demonstrate the significant role of the stress tensor in the elastic-inertial regime.

关键词： Two-fluid model inertial number Fluidized bed Flow regime Particle Reynolds stress MFIX

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A preliminary study on rheology model of coarse particulate matter in debris flows

A preliminary study on rheology model of coarse particulate ...

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中国水利学会2016学术年会

作者： Tang jinbo Lin Pengzhi Cui Peng Hu Kaiheng Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of SciencesInstitute of Mountain Hazards and EnvironmentChinese Academy of Sciences and Ministry of Water Conservancy State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University CAS Center for Excellence in Tibetan Plateau Earth Sciences

Debris flows are a kind of rapid geomorphologic processes,which lies in the range of phenomena intermediate between sediment-laden water floods and landslides and are regarded as particular solid-hquid two-phase *** liquid-phase is the slurry,which is composed by water and fine-particles in debris flows with intensive mixing and behaves as a non-Newtonian fluid simulated by Bingham model or Herschel-Bulkley *** solid-phase is consisted of coarse-particles in debris *** friction and collision between coarse-particles cause the loss of kinetic energy of debris flows and slow down the motion of debris *** solid-particles in debris flows,the rheology model is often considered to be a qualified dynamic ***,the μ（I）-rheology model of granular flows was proposed by ***（2004）,which is phenomenological one fitted by data of experiments and numerical simulations,In this model,the friction coefficient μ increases with I,which is called the inertial number representing the relative importance between inertial stress of particles and imposed *** the μ（I）-rheology model the volume concentration of solid-particles could not be directly solved with governing equation due to the absence of state *** the present study,we have re-investigated the characteristics of solid-liquid two-phase flow of debris flows and the properties of μ（I）-rheology *** results show that μ（I）-rheology model may not be the best model to describe the dynamics of debris *** the other hand,the frictional-collisional rheology models have provided a clear physical meaning and are able to describe the friction and collision between solid-particles *** comparisons to the available experimental data also support the use of the proposed frictional-collisional rheology models.

关键词： Debris flows two-phase flow Granular flows μ(I)-rheology inertial number

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