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Multi-Scale Modelling Of Granular Avalanches

Krishna Kumar, Kenichi Soga, Jean-Yves Delenne
2013 Zenodo  
Velocity profiles obtained from both the scales are compared to understand the reason for a slow flow run-out mobilization in MPM simulations.  ...  Avalanches, debris flows, and landslides are geophysical hazards, which involve rapid mass movement of granular solids, water and air as a single-phase system.  ...  Farhang Radjaï for his useful interactions during various stages of this research work.  ... 
doi:10.5281/zenodo.546602 fatcat:els5xb4terfnncdqzfhve7k5we

Modeling of debris flow depositional patterns according to the catchment and sediment source area characteristics

Davide Tiranti, Chiara Deangeli
2015 Frontiers in Earth Science  
A key issue to be considered in debris flow modeling is whether the actual flow behavior can be regarded as a viscoplastic flow or a frictional/collisional flow.  ...  The numerical simulations of debris flows have been carried out with the frictional/collisional rheology.  ...  The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Received  ... 
doi:10.3389/feart.2015.00008 fatcat:kwnvxdemhzhcvhd22h4sk4jaxu

A quantification of hydrodynamical effects on protoplanetary dust growth

E. Sellentin, J. P. Ramsey, F. Windmark, C. P. Dullemond
2013 Astronomy and Astrophysics  
We also demonstrate why such a gas flow does not return collisional debris to the surface of a proto-planetesimal. Conclusions.  ...  Therefore, we provide parameterizations ready for implementation into a dust coagulation code.  ...  We thank the anonymous referee for a careful and thorough review which improved the manuscript. J.P.R. is supported by DFG grant DU 414/9-1.  ... 
doi:10.1051/0004-6361/201321587 fatcat:oyt4jzzyqvdkjakg7nfu2fqg2u

Coupled DEM-LBM method for the free-surface simulation of heterogeneous suspensions

Alessandro Leonardi, Falk K. Wittel, Miller Mendoza, Hans J. Herrmann
2014 Computational Particle Mechanics  
The models allows for a full coupling of the phases, but in a simplified way. An experimental validation is given by an example of gravity driven flow of a particle suspension.  ...  A promising way for numerical simulations of such systems is given by hybrid computational frameworks.  ...  Summary In this paper a model for the simulation of the flow of suspensions was proposed.  ... 
doi:10.1007/s40571-014-0001-z fatcat:ceyvkhb2r5b6xmdy6wuvcwfjuu

Micro origins for macro behavior in granular media

Jidong Zhao, Mingjing Jiang, Kenichi Soga, Stefan Luding
2016 Granular Matter  
We report the latest advances in understanding, characterization and modeling of key micro mechanisms and origins underpinning the interesting and complex macroscopic behavior of granular matter.  ...  the jamming transition from fluid-to solid-like behavior, critical state flow and wave propagation, (b) the signature of fabric and its evolution for granular media under general loading conditions, and  ...  J.Z. acknowledges support from the University Grants Council of Hong Kong through a Theme-based Research Project T22-603/15N.  ... 
doi:10.1007/s10035-016-0662-9 fatcat:wjh6emtryncp3ezlcs3iaof62u

Page 508 of Journal of Sedimentary Research Vol. 67, Issue 3 [page]

1997 Journal of Sedimentary Research  
., 1985, A granular-fluid model for steady intense bed-load transport: Journal of Geophysical Research, v. 90, p. 9149-9158.  ...  ., and Paviovitcu, A., 1992, Three-dimensional model for particle-size segregation by shaking: Physical Review Letters, v. 69, p. 640-643.  ... 

Laboratory and Field Test and Distinct Element Analysis of Debris Flow

Yung Ming Cheng, Na Li, Ivan Wing Hong Fung
2018 NHESSD  
It is also found from the laboratory tests and numerical simulations that a jump in the flume can help to reduce the final velocity of the debris flow which is useful for practical purposes.</p>  ...  Distinct element (DEM) debris flow modeling are also carried out to model the flow process.  ...  Fig. 1 Fig. 2 A 12 Representative debris flow in Hong Kong and Shenzhen, China (a) Tsing Shan debris flow 68 in 1990; (b) debris flow in Shenzhen 2015. three-dimensional slope stability analysis for a  ... 
doi:10.5194/nhess-2018-36 fatcat:b4pwibvwbvenjhyknmrnuwbnui

An energy-based approach to predict debris flow mobility and analyze empirical relationships

Francesco Federico, Chiara Cesali
2015 Canadian geotechnical journal (Print)  
To overcome their large variability and define their fields of applicability, an energy-based model, predicting debris flow mobility, is developed.  ...  , such as grain size material, interstitial pressures, grain collisions, and erodibility of the crossed channel; and (ii) defining of the favourable conditions for debris flows mechanism generation.  ...  for a debris flow (Fig. 46) .  ... 
doi:10.1139/cgj-2015-0107 fatcat:tcis3htr7rcjxcgx3bcpzcociq

EM08 mini-symposium on granular materials—editorial: interconnecting engineering and physics perspectives

K. M. Hill, Hayley Shen
2010 Granular Matter  
Ruiz-Angulo and Hunt address the need for certain collisional parameters for developing models in granular-fluid flows.  ...  in pipeline flow and in geophysical flows such as debris flows.  ... 
doi:10.1007/s10035-010-0175-x fatcat:jzdpcbu6trbjnjzbac3dbwtvb4

Locally mesh-refined lattice Boltzmann method for fuel debris air cooling analysis on GPU supercomputer

Naoyuki ONODERA, Yasuhiro IDOMURA, Shinichiro UESAWA, Susumu YAMASHITA, Hiroyuki YOSHIDA
2020 Mechanical Engineering Journal  
A dry method is one of practical methods for retrieving debris from the reactor.  ...  To resolve this issue, it is necessary to develop a new simulation code suitable for such large-scale Abstract A dry method is one of practical methods for decommissioning the TEPCO's Fukushima Daiichi  ...  Acknowledgments This research was supported in part by the Japan Society for the Promotion of Science (KAKENHI), a Grant-in-Aid for Scientific Research (C) 19K11992, JP17K06570, and (B) JP17H03493 from  ... 
doi:10.1299/mej.19-00531 fatcat:vkyeckd5u5ccbnaie3jr2kprdy

Laboratory and field tests and distinct element analysis of dry granular flows and segregation processes

Yung Ming Cheng, Wing Hong Ivan Fung, Liang Li, Na Li
2019 Natural Hazards and Earth System Sciences  
Distinct element modelling (DEM) of dry granular flow is also carried out for the flow process.  ...  It is also found from the laboratory tests and numerical simulations that a jump in the flume can help to reduce the final velocity of the granular flow, which is useful for practical purposes.</p>  ...  The use of a meshless method to model debris flow has recently been considered by Wong (2018) .  ... 
doi:10.5194/nhess-19-181-2019 fatcat:3clxclldwneppnw5hliqyhgiji

Rock-and-soil avalanches: Theory and simulation

Alfredo Taboada, Nicolas Estrada
2009 Journal of Geophysical Research  
Avalanche motion is modeled as a dense granular flow of dry frictional and cohesive particles.  ...  1] We present a 2-D Contact Dynamics discrete element model for simulating initiation and motion of rock avalanches, integrating hillslope geometry, Mohr-Coulomb rock behavior, pore pressure before avalanche  ...  Radjaï for discussions on granular mechanics and participation in the development of simulation programs and A. Delplanque for technical help. We thank M.  ... 
doi:10.1029/2008jf001072 fatcat:qgstl7k5v5hmboml5ije5mmbju

Expansion of a laser plume from a silicon wafer in a wide range of ambient gas pressures

Alexey N. Volkov, Gerard M. O'Connor, Thomas J. Glynn, German A. Lukyanov
2008 Applied Physics A: Materials Science & Processing  
Axisymmetric flow in the laser plume is calculated by the direct simulation Monte Carlo method.  ...  The plume is generated by a nanosecond Gaussian laser pulse. Absorption of laser radiation and heating and melting of the target are described by a two-dimensional thermal model.  ...  Data about the collisional cross-sections for silicon vapor and other gases at high temperatures is limited, therefore the simplest model of binary collisions between two gas particles is used.  ... 
doi:10.1007/s00339-008-4587-y fatcat:srf52tlbujhltkvwqij5gcw3pq

Can Dispersive Pressure Cause Inverse Grading in Grain Flows?

F. Legros
2002 Journal of Sedimentary Research  
A basal shear zone under a rigid plug has also often been postulated for pyroclastic and debris flows on the assumption that such flows behave macroscopically like a Bingham fluid, and this has been thought  ...  Naylor (1980) proposed another mechanism for the formation of inverse grading at the base of debris-flow deposits.  ... 
doi:10.1306/041301720166 fatcat:nlmkwdfbkjayficx73rp3rzb7a

Gas-kinetic unified algorithm for computable modeling of Boltzmann equation and application to aerothermodynamics for falling disintegration of uncontrolled Tiangong-No.1 spacecraft

Zhi-Hui Li, Ao-Ping Peng, Qiang Ma, Lei-Ning Dang, Xiao-Wei Tang, Xue-Zhou Sun
2019 Advances in Aerodynamics  
The unified algorithm of the Boltzmann model equation involving thermodynamics non-equilibrium effect is presented for the whole range of flow regimes.  ...  To study aerodynamics of spacecraft reentry covering various flow regimes, a Gas-Kinetic Unified Algorithm (GKUA) has been presented by computable modeling of the collision integral of the Boltzmann equation  ...  By using a simplified collision relaxation model to replace the collisional integral of the Boltzmann equation, the kinetic model equation retains the basic properties of the Boltzmann equation, such as  ... 
doi:10.1186/s42774-019-0009-4 fatcat:i362r52s5nefhmiito3xu5ejqu
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