Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

Volumes:
Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013007679
pages 1001-1048

DIRECT NUMERICAL AND LARGE-EDDY SIMULATION OF PRIMARY ATOMIZATION IN COMPLEX GEOMETRIES

Olivier Desjardins
Sibley School of Mechanical and Aerospace Engineering Cornell University 250 Upson Hall, Ithaca, NY 14853 USA
Jeremy McCaslin
Sibley School of Mechanical and Aerospace Engineering Cornell University 245 Upson Hall, Ithaca, NY 14853 USA
Mark Owkes
Department of Mechanical and Industrial Engineering, Montana State University, Bozeman, MT, 59717-3800, USA
Peter Brady
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853-7501, USA

RESUMO

A detailed understanding of the driving mechanisms behind primary atomization is crucial to the optimization of sprays for efficient combustion in modern propulsion systems. Many challenges are associated with simulating realistic turbulent atomization, such as the multiplicity of length and time scales of the turbulent flow field and gas-liquid interface, discontinuous fluid properties and pressure at the phase interface, high density ratios that degrade numerical robustness, and complex shapes of spray injectors. These challenges have hindered progress in computational modeling of atomizing two-phase flows, and as a result a complete characterization of all physical processes involved in turbulent atomization has remained elusive. This paper presents a suite of computational tools that have been developed in an effort to simulate primary atomization from first principles. The incompressible Navier-Stokes equations are handled in the context of a high-order accurate, discretely conservative, finite difference solver shown to be ideally suited for direct numerical and large-eddy simulations of turbulence. A conservative level set method is used for interface capture, improved through the use of local re-initialization enabled by an efficient fast marching method. A high-density ratio correction algorithm is employed that leads to tighter coupling between mass and momentum transport. Finally, the use of immersed boundaries allows for modeling of complex geometries without requiring body-fitted meshes, eliminating time spent generating complex grids. The framework outlined herein is shown to have the ability to capture important instabilities for atomizing flows, such as Rayleigh-Plateau and Kelvin-Helmholtz instabilities. Simulations of air-assisted breakup of both planar and coaxial liquid layers are shown to agree well with theoretical and experimental results. This strategy is employed to simulate the breakup of a turbulent liquid jet under diesel conditions, the atomization of a liquid sheet issued from a pressure swirl atomizer, and finally a complete dual-orifice atomizer, leading to qualitative insights on the atomization process. Detailed parallel scaling results are also provided.


Articles with similar content:

EMBEDDED DNS CONCEPT FOR SIMULATING THE PRIMARY BREAKUP OF AN AIRBLAST ATOMIZER
Atomization and Sprays, Vol.26, 2016, issue 3
Johannes Janicka, Amsini Sadiki, Benjamin Sauer
HIGH-FIDELITY SIMULATION OF FUEL ATOMIZATION IN A REALISTIC SWIRLING FLOW INJECTOR
Atomization and Sprays, Vol.23, 2013, issue 11
Marios Soteriou, Xiaoyi Li
END OF INJECTION PROCESS IN A SINGLE-HOLE DIESEL INJECTOR
Atomization and Sprays, Vol.28, 2018, issue 1
V. Garaniya, P. A. Brandner, Mohammadmahdi Ghiji, P. Hield, Laurie Goldsworthy
EFFERVESCENT ATOMIZATION FOR INDUSTRIAL ENERGY−TECHNOLOGY REVIEW
Atomization and Sprays, Vol.20, 2010, issue 6
Richard Marsh, Andrew Crayford, Phil J. Bowen, Dancho Konstantinov
A NEW ADAPTIVE MULTISCALE METHOD FOR DIRECT NUMERICAL SIMULATION OF SHEARED LIQUID SHEET
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2015, issue
Jean-Luc Estivalezes, Davide Zuzio