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Atomization and Sprays
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Erscheint 12 Ausgaben pro Jahr

ISSN Druckformat: 1044-5110

ISSN Online: 1936-2684

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DIRECT INTERFACE TRACKING OF DROPLET DEFORMATION

Volumen 12, Ausgabe 5&6, 2002, pp. 721-735
DOI: 10.1615/AtomizSpr.v12.i56.110
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David P. Schmidt
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
Meizhong Dai
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, Massachusetts, USA
Haoshu Wang
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, Massachusetts, USA
J. Blair Perot
Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, Massachusetts, USA

ABSTRAKT

Direct interface tracking computes spray behavior based only on first principles. It is an advanced form of direct numerical simulation, but with the emphasis shifted from resolving details of turbulence to details of multiphase flow. The moving interface requires special treatment and advanced numerical methods. A code that is capable of accurate resolution of three-dimensional free-surface deformation has been constructed. The Navier-Stokes equations for the liquid phase are solved on a deforming unstructured mesh. This technique tracks the boundary precisely, similar to marker-and-cell methods. However, the adaptive mesh deforms with the interface. Furthermore, this new method avoids the surface reconstruction required in volume-of-fluid methods. The numerical scheme produces a positive-definite matrix that is solved using a conjugate gradient method. In order to maintain mesh quality, the mesh point connectivity and node locations are updated each time step. The results demonstrate the performance and accuracy of this technique. The method used for the surface tension force is shown to be second-order-accurate in space. By locally fitting the free surface to a parabola when evaluating curvature, problems with numerical noise in the solution are avoided. A time-step criterion based on free-surface numerical stability is discussed. The results for a deforming drop and collapsing ligament are presented. The code is validated by comparison to the theoretical period for drop deformation.

REFERENZIERT VON

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  2. Dai Meizhong, Schmidt David P., Numerical simulation of head-on droplet collision: Effect of viscosity on maximum deformation, Physics of Fluids, 17, 4, 2005. Crossref

  3. Quan Shaoping, Schmidt David P., Direct numerical study of a liquid droplet impulsively accelerated by gaseous flow, Physics of Fluids, 18, 10, 2006. Crossref

  4. Yue Pengtao, Feng James J., Bertelo Christopher A., Hu Howard H., An arbitrary Lagrangian–Eulerian method for simulating bubble growth in polymer foaming, Journal of Computational Physics, 226, 2, 2007. Crossref

  5. Quan Shaoping, Schmidt David P., A moving mesh interface tracking method for 3D incompressible two-phase flows, Journal of Computational Physics, 221, 2, 2007. Crossref

  6. Tuković Ž., Jasak H., A moving mesh finite volume interface tracking method for surface tension dominated interfacial fluid flow, Computers & Fluids, 55, 2012. Crossref

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  8. Li XiaoLiang, He GuoWei, Zhang Xing, Numerical simulation of drop oscillation in AC electrowetting, Science China Physics, Mechanics and Astronomy, 56, 2, 2013. Crossref

  9. Burghoff Sylvia, Kenig Eugeny Y., CFD modelling of mass transfer and interfacial phenomena on single droplets, in European Symposium on Computer-Aided Process Engineering-15, 38th European Symposium of the Working Party on Computer Aided Process Engineering, 20, 2005. Crossref

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