About Dr Benjy Marks

I research a variety of phenomena in granular materials. These include segregation of debris flows and avalanches, the mixing of pharmaceutical powders and CO2 geo-sequestration. My main passion is the field of grainsize dynamics, which is a holistic approach towards describing segregation, comminution, mixing, melting and agglomeration in granular flows.

I have a BEng/BSc (Hons I) and PhD all from The University of Sydney. I have worked in the Geomechanics group at ETH Z├╝rich, Switzerland, the Department of Civil, Environmental and Geomatic Engineering at University College London, UK and the Department of Physics at Oslo University, Norway. I am now a Lecturer in the School of Civil Engineering at The University of Sydney.

I am pioneering new X-ray imaging techniques for bulk solids and granular flow applications. At the same time, I am developing new computational tools to take the insights we gain from our experimental observations, and use them to inform theoretical predictions. Because of the complexity of these systems, I am developing further numerical tools, which are required to predict the behaviour of new systems.

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Selected publications


  1.  Benjy Marks, Bjørnar Sandnes, Guillaume Dumazer, Jon Alm Eriksen and Knut Jørgen Måløy. Compaction of granular material inside confined geometries. Frontiers in Physics, 3, 00041, 2015,doi:10.3389/fphy.2015.00041PDF
  2. Jon Alm Eriksen, Benjy Marks, Bjørnar Sandnes and Renaud Toussaint. Bubbles breaking the wall: Two-dimensional stress and stability analysis. Physical Review E91, 052204, 2015,doi:10.1103/PhysRevE.91.052204PDF.
  3. Benjy Marks and Itai Einav. A mixture of crushing and segregation: The complexity of grainsize in natural granular flows, Geophysical Research Letters42, 2014, doi:10.1002/2014GL062PDF.
  4. Benjy Marks, Pierre Rognon and Itai Einav. Grainsize dynamics of polydisperse granular segregation down inclined planes. Journal of Fluid Mechanics690, 2011. doi:10.1017/jfm.2011.454 PDF.
  5. Benjy Marks, Itai Einav. A cellular automaton for segregation during granular avalanches. Granular Matter13, 3, 211-214, 2011.doi:10.1007/s10035-010-0247-yPDF.
  6. M.J. Steel, Benjy Marks, Adel Rahmani. Properties of sub-diffraction limited focusing by optical phase conjugation. Optics Express18, 2, 1487-1500, 2010. doi:10.1364/OE.18.001487PDF.