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Abstract

A parallel computing Eulerian/Lagrangian multi-scale coupling procedure for diesel spray simulation is presented. Early breakup of the diesel jet is captured by using a compressible Volume of Fluid (VOF) method. In regions where the phase interface can no longer be sufficiently resolved, separated and small scale liquid structures are described by a Lagrangian Parcel Tracking (LPT) approach, in conjunction with secondary breakup modelling and a turbulence stochastic dispersion model. The coupling of these two descriptions utilises a Region Coupling Method and an efficiently parallelised droplet identification and extraction procedure. This approach enables run-time VOF-LPT field coupling and filters small-scale liquid structures that are suitable candidates for Eulerian-liquid-structure/Lagrangian droplet conversion, preserving their position, mass and momentum. The coupling procedure is initially applied to model the atomisation of a simple liquid jet and the results are compared with that of a statistical coupling approach to demonstrate the performance of the developed coupling procedure. Its application is then extended to simulate a real diesel spray from a nozzle with a sharp entrance. Coupling in-nozzle phenomena such as flow separation, flow detachment and turbulence to the primary and secondary spray atomisation, provides a tool for the prediction of complex spray dynamics.

Item Type:	Article
Authors/Creators:	Yu, H and Goldsworthy, L and Ghiji, M and Brandner, PA and Garaniya, V
Keywords:	Eulerian (Volume of Fluid), Lagrangian Parcel Tracking, parallel coupling, two-phase flows, compressible flow, diesel spray atomisation
Journal or Publication Title:	Computers and Fluids
Publisher:	Pergamon Press
ISSN:	0045-7930
DOI / ID Number:	10.1016/j.compfluid.2017.03.027
Copyright Information:	Copyright 2017 Elsevier Ltd.
Related URLs:	Google Scholar: Brandner, PA UTAS Profile: Brandner, PA Google Scholar: Garaniya, V UTAS Profile: Garaniya, V
Item Statistics:	View statistics for this item

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