Direct numerical simulation of multiphase flows with unstable interfaces
Visualitza/Obre
10.1088/1742-6596/745/3/032114
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/93051
Tipus de documentArticle
Data publicació2016-09-01
EditorInstitute of Physics (IOP)
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
This paper presents a numerical model that intends to simulate efficiently the surface instability that arise in multiphase flows, typically liquid-gas, both for laminar or turbulent regimes. The model is developed on the in-house computing platform TermoFluids , and operates the finite-volume, direct numerical simulation (DNS) of multiphase flows by means of a conservative level-set method for the interface-capturing. The mesh size is optimized by means of an adaptive mesh refinement (AMR) strategy, that allows the dynamic re-concentration of the mesh in the vicinity of the interfaces between fluids, in order to correctly represent the diverse structures (as ligaments and droplets) that may rise from unstable phenomena. In addition, special attention is given to the discretization of the various terms of the momentum equations, to ensure stability of the flow and correct representation of turbulent vortices. As shown, the method is capable of truthfully simulate the interface phenomena as the Kelvin-Helmholtz instability and the Plateau-Rayleigh instability, both in the case of 2-D and 3-D configurations. Therefore it is suitable for the simulation of complex phenomena such as simulation of air-blast atomization, with several important application in the field of automotive and aerospace engines. A prove is given by our preliminary study of the 3-D coaxial liquid-gas jet.
Descripció
Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd.
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
CitacióSchillaci, E., Lehmkuhl, O., Antepara, O., Oliva, A. Direct numerical simulation of multiphase flows with unstable interfaces. "Journal of physics: conference series", 1 Setembre 2016, vol. 745, núm. 3, p. 1-8.
ISSN1742-6588
Versió de l'editorhttp://iopscience.iop.org/article/10.1088/1742-6596/745/3/032114/pdf
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