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dc.contributor.authorBalcázar Arciniega, Néstor
dc.contributor.authorCastro González, Jesús
dc.contributor.authorChiva Segura, Jorge
dc.contributor.authorOliva Llena, Asensio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.identifier.citationBalcázar, N., Castro, J., Chiva, J., Oliva, A. DNS of falling droplets in a vertical channel. "International journal of computational methods and experimental measurements", 1 Febrer 2018, vol. 6, núm. 2, p. 398-410.
dc.description© 2018 WIT Press
dc.description.abstractThis paper presents Direct Numerical Simulation (DNS) of the falling motion of single and multiple deformable drops in a vertical channel. A systematic study of the wall effect on the motion of single drop is performed for Eötvös number (0.5=Eo=5), Morton number (10-3=M=10-8), and confinement ratio CR = 2. Second, the gravity-driven motion of multiple drops and their interactions are studied in a periodic vertical channel for CR = 4. These simulations are performed using a multiple marker level-set methodology, integrated in a finite-volume framework on a collocated unstructured grid. Each droplet is described by a level-set function, which allows capturing multiple interfaces in the same control volume, avoiding the numerical merging of the droplets. Numerical algorithms for fluid motion and interface capturing have been developed in the context of the finite-volume and level-set methodology, surface tension is modeled by means of the continuous surface force approach, and the pressure-velocity coupling is solved using a fractional-step projection method. DNS of single drop shows that they migrate to the symmetry axis of the channel when the Reynolds number is low, following a monotonic approach or damped oscillations according to the dimensionless parameters. If Eötvös number increases, stronger oscillations around the symmetry axis are observed. Simulations of multiple drops show that the collision of two drops follows the drafting-kissing tumbling (DKT) phenomenon. Deformable drops do not collide with the wall, whereas DKT phenomenon in the droplet swarm leads to the formation of groups which move through the center of the channel.
dc.format.extent13 p.
dc.publisherWIT Press
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica
dc.subject.lcshFluid dynamics
dc.subject.lcshSimulation methods
dc.subject.otherConservative level-set method
dc.subject.otherInterface capturing
dc.subject.otherMultiphase flow
dc.subject.otherMultiple marker
dc.subject.otherSurface tension
dc.subject.otherVertical channel
dc.titleDNS of falling droplets in a vertical channel
dc.subject.lemacDinàmica de fluids -- Mètodes numèrics
dc.subject.lemacSimulació, Mètodes de
dc.contributor.groupUniversitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
upcommons.citation.authorBalcázar, N.; Castro, J.; Chiva, J.; Oliva, A.
upcommons.citation.publicationNameInternational journal of computational methods and experimental measurements

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