Modelling ripple morphodynamics driven by colloidal deposition

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dc.contributor.authorHewett JN
dc.contributor.authorSellier M
dc.date.accessioned2020-09-22T04:19:22Z
dc.date.available2020-09-22T04:19:22Z
dc.date.issued2018en
dc.date.updated2020-07-28T23:36:43Z
dc.description.abstract© 2017 Elsevier Ltd Fluid dynamics between a particle–laden flow and an evolving boundary are found in various contexts. We numerically simulated the morphodynamics of silica particle deposition from flowing water within geothermal heat exchangers using the arbitrary Lagrangian–Eulerian method. The silica particles were of colloidal size, with submicron diameters, which were primarily transported through the water via Brownian motion. First, we validated the Euler–Euler approach for modelling the transport and deposition of these colloidal particles within a fluid by comparing our simulation results with existing experiments of colloidal polystyrene deposition. Then we combined this multiphase model with a dynamic mesh model to track the gradually accumulated silica along the pipe walls of a heat exchanger. Surface roughness was modelled by prescribing sinusoidally–shaped protrusions on the wall boundary. The silica bed height grew quickest at the peaks of the ripples and the spacing between the protrusions remained relatively constant. The rough surface experienced a 20% reduction in silica deposition when compared to a smooth surface. We also discuss the challenges of mesh deforming simulations with an emphasis on the mesh quality as the geometry changes over time.en
dc.identifier.citationHewett JN, Sellier M (2018). Modelling ripple morphodynamics driven by colloidal deposition. Computers and Fluids. 163. 54-67.en
dc.identifier.doihttp://doi.org/10.1016/j.compfluid.2017.12.017
dc.identifier.issn0045-7930
dc.identifier.issn1879-0747
dc.identifier.urihttps://hdl.handle.net/10092/101072
dc.languageen
dc.language.isoen
dc.publisherElsevier BVen
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subjectEvolving boundaryen
dc.subjectNode shuffle algorithmen
dc.subjectParticle depositionen
dc.subjectSilica scalingen
dc.subjectDynamic meshen
dc.subject.anzsrcFields of Research::40 - Engineering::4012 - Fluid mechanics and thermal engineering::401204 - Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)en
dc.subject.anzsrcFields of Research::40 - Engineering::4012 - Fluid mechanics and thermal engineering::401210 - Microfluidics and nanofluidicsen
dc.titleModelling ripple morphodynamics driven by colloidal depositionen
dc.typeJournal Articleen
uc.collegeFaculty of Engineering
uc.departmentMechanical Engineering
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