Researcher: Kayaalp, Arif Doruk
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Kayaalp, Arif Doruk
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Publication Metadata only An auxiliary grid method for computations of multiphase flows in complex geometries(Academic Press Inc Elsevier Science, 2006) N/A; Department of Mechanical Engineering; N/A; Department of Mechanical Engineering; Muradoğlu, Metin; Kayaalp, Arif Doruk; Faculty Member; Master Student; College of Engineering; Graduate School of Sciences and Engineering; 4656; N/AA method is developed for computations of interfacial flows in complex geometries. The method combines a front-tracking method with a newly developed finite volume (FV) scheme and utilizes an auxiliary grid for computationally efficient tracking of interfaces in body-fitted curvilinear grids. The tracking, algorithm reduces particle tracking in a curvilinear grid to tracking on a uniform Cartesian grid with a look up table. The algorithm is general and can be used for other applications where Lagrangian particles have to be tracked in curvilinear or unstructured grids. The spatial and temporal errors are examined and it is shown that the method is globally second order accurate both in time and space. The method is implemented to solve two-dimensional (planar or axisymmetric) interfacial flows and is validated for a buoyancy-driven drops in a straight tube and the motion of buoyancy-driven drops in a periodically constricted channel.Publication Metadata only A finite-volume/front-tracking method for computations of multiphase flows in complex geometries(Springer, 2006) N/A; Department of Mechanical Engineering; N/A; N/A; Department of Mechanical Engineering; Muradoğlu, Metin; Olgaç, Ufuk; Kayaalp, Arif Doruk; Faculty Member; Master Student; Master Student; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 46561; N/A; N/AA finite-volume/front-tracking (FV/FT) method is developed for computations of multiphase flows in complex geometries. The front-tracking methodology is combined with a dual time-stepping based FV method. The interface between phases is represented by connected Lagrangian marker points. An efficient algorithm is developed to keep track of the marker points in curvilinear grids. The method is implemented to solve two-dimensional (plane or axisymmetric) dispersed multiphase flows and is validated for the motion of buoyancy-driven drops in a periodically constricted tube with cases where drop breakup occurs.Publication Metadata only Buoyancy-driven motion and breakup of viscous drops in constricted capillaries(Pergamon-Elsevier Science Ltd, 2006) N/A; N/A; N/A; Department of Mechanical Engineering; Department of Mechanical Engineering; Olgaç, Ufuk; Kayaalp, Arif Doruk; Muradoğlu, Metin; Master Student; Master Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 46561Buoyancy-driven motion and breakup of viscous drops in sinusoidally constricted channels are studied computationally using a finite-volume/front-tracking (FV/FT) method. Computational results are first compared with the available experimental data and then the conditions for a drop breakup are examined. The effects of the channel geometry, drop size and Bond number on drop breakup are investigated. It is found that the present computational results are in a good agreement with the available experimental data and drop breakup occurs in various modes depending on the channel geometry, the relative drop size and Bond number. It is observed that a drop breaks up into two or more drops when its size is larger than a critical value. It is also found that large drops undergo successive breakups to produce monodispersed small droplets. Critical non-dimensional drop size and critical capillary number for the onset of drop breakup are reported over a wide range of geometrical parameters and Bond numbers.