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dc.contributor.authorWang, Sheng
dc.date.accessioned2019-04-02T14:00:25Z
dc.date.available2019-04-02T14:00:25Z
dc.date.issued2018-12-30
dc.identifier.otherWang_cornellgrad_0058F_11237
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:11237
dc.identifier.otherbibid: 10758036
dc.identifier.urihttps://hdl.handle.net/1813/64896
dc.description.abstractPredictive simulation of two-phase flows with moving contact lines is challenging due to their inherent multi-physics and multi-scale nature. Directly simulating such flows incurs an enormous computational cost due to the widely disparate scales at the contact line. Moreover, simulations of viscosity-dominated two-phase flows with moving contact lines are often reported to be mesh-dependent due to the diverging viscous stress at the contact point. This dissertation addresses the above simulation issues and by building a numerical framework to enable large-scale 3D simulations of two-phase flows in complex geometries. By analyzing the weak form of the Navier-Stokes equations for a control volume adjacent to a wall with moving contact line, two unclosed terms are identified: a sub-grid scale (SGS) surface tension force and an SGS viscous force. A closure for the SGS surface tension force is first proposed and tested in a numerical framework for simulating two-phase flows with contact lines. This framework combines a conservative level set method to capture the interface and a conservative cut-cell immersed boundary method to handle complex geometries. Detailed verification tests confirm that simulations using this framework are discretely conservative, accurate, and robust. Secondly, a physics-based closure is derived for the SGS viscous force. Simulations these two SGS models are verified to be mesh-independent and physically accurate across a number of viscosity-dominated two-phase flows, including drop spreading on a horizontal plane and drop sliding down an inclined plane. Finally, the present approach is applied in the study of drop-fiber interactions and jet-wall interactions.
dc.language.isoen_US
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectFluid Mechanics
dc.subjectComputational physics
dc.subjectMechanical engineering
dc.subjectfluid structure interaction
dc.subjectliquid-gas flows
dc.subjectmoving contact lines
dc.titleTOWARDS LARGE-SCALE SIMULATIONS OF TWO-PHASE FLOWS WITH MOVING CONTACT LINES IN COMPLEX GEOMETRIES
dc.typedissertation or thesis
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Mechanical Engineering
dc.contributor.chairDesjardins, Olivier
dc.contributor.committeeMemberSteen, Paul Herman
dc.contributor.committeeMemberBindel, David S.
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/n0kz-v814


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