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Pattern formation of frictional fingers in a gravitational potential / Jon Alm Eriksen; Renaud Toussaint; Knut Jørgen Måløy; Eirik Flekkøy; Olivier Galland; Bjørnar Sandnes
Physical Review Fluids, Volume: 3, Issue: 1
Swansea University Author: Sandnes, Bjornar
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Aligned finger structures, with a characteristic width, emerge during the slow drainage of a liquid-granular mixture in a tilted Hele-Shaw cell. A transition from vertical to horizontal alignment of the finger structures is observed as the tilting angle and the granular density are varied. An analyt...
|Published in:||Physical Review Fluids|
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Aligned finger structures, with a characteristic width, emerge during the slow drainage of a liquid-granular mixture in a tilted Hele-Shaw cell. A transition from vertical to horizontal alignment of the finger structures is observed as the tilting angle and the granular density are varied. An analytical model is presented, demonstrating that the alignment properties are the result of the competition between fluctuating granular stresses and the hydrostatic pressure. The dynamics is reproduced in simulations. We also show how the system explains patterns observed in nature, created during the early stages of a dike formation.
2018. The paper capped a comprehensive study, years in the making, that discovered a new multiphase flow mechanism responsible for structural features observed on certain volcanic dyke walls. The study was multidisciplinary (physics, geology, engineering), involving collaborators from several groups (University of Oslo, University of Strasbourg, Swansea University), and required a combination of detailed experiments, numerical simulations and theoretical analytical models. The results have been featured on popular science blogs, and the authors have presented the work in several invited talks at international conferences.
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