student profile: Mr Prashidha Kharel


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Thesis work

Thesis title: Internal dynamics and flow properties of dense granular material

Supervisors: Pierre ROGNON , Yixiang GAN

Thesis abstract:

Landslides and snow avalanches involve the flow of billions of grains, be they soil particles or snowflakes. This work aims at establishing the flowing properties of such granular materials. Can we predict their viscosity? Under which conditions flows would start or stop?�br /�  �br /� Granular materials can undergo dynamic phase transition between static and flowing state called the jamming transition. The fact that the amorphous structural organisation of particles in the solid state is indistinguishable from that in the liquid state makes it difficult to predict the initiation or stoppage of granular flows.�br /�  �br /� Granular materials also exhibit non-local flow behaviour, i.e. the viscosity or the ability to flow at one location is strongly affected by the nature of flow in the surrounding. This makes it difficult to predict the flow in complex geometries.�br /�  �br /� In order to understand these complex flow behaviours, simulations of dense granular flows are conducted, enabling us to measure their flowing properties and to establish their microstructure at the scale of the grain and of their organization. Specifically, this work focuses on three properties of granular flow: non-locality, jamming and mixing.�br /�  �br /� Besides improvement in our ability to predict the flow path of landslides and snow avalanches, this work will also help the mining, food and pharmaceutical industries to optimize processes involving transport and mixing of grains. More generally, the findings will improve our understanding of the flow properties of a wider class of materials named “glassy materials”, that include granular suspensions, foams and emulsions.

Selected publications

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Journals

  • Athani, S., Kharel, P., Airey, D., Rognon, P. (2017). Grain-size effect on uplift capacity of plate anchors in coarse granular soils. Geotechnique Letters, 7(2), 1-7. [More Information]
  • Kharel, P., Rognon, P. (2017). Partial jamming and non-locality in dense granular flows. EPJ Web of Conferences, 140, 1-4. [More Information]
  • Kharel, P., Rognon, P. (2017). Vortices Enhance Diffusion in Dense Granular Flows. Physical Review Letters, 119(14), Article number 178001. [More Information]

Conferences

  • Rognon, P., Kharel, P., Miller, T., Einav, I. (2017). How granular vortices can help understanding rheological and mixing properties of dense granular flows. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]

2017

  • Athani, S., Kharel, P., Airey, D., Rognon, P. (2017). Grain-size effect on uplift capacity of plate anchors in coarse granular soils. Geotechnique Letters, 7(2), 1-7. [More Information]
  • Rognon, P., Kharel, P., Miller, T., Einav, I. (2017). How granular vortices can help understanding rheological and mixing properties of dense granular flows. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
  • Kharel, P., Rognon, P. (2017). Partial jamming and non-locality in dense granular flows. EPJ Web of Conferences, 140, 1-4. [More Information]
  • Kharel, P., Rognon, P. (2017). Vortices Enhance Diffusion in Dense Granular Flows. Physical Review Letters, 119(14), Article number 178001. [More Information]

Note: This profile is for a student at the University of Sydney. Views presented here are not necessarily those of the University.