Assessment of the grid requirements for the modelling of the dynamics of high speed evaporating sprays using LES / Eulerian-Lagrangian frameworks

Research output: Contribution to conferencePaper

Abstract

The physics of high speed liquid jets injected in elevated temperature and pressure conditions are extremely complex due to the multi-scale and multiphase flow characteristics. Large eddy simulations (LES) are widely applied for simulations of multiphase flows because large scale mixing of ambient air with the liquid vapour (when evaporation is occurring) is better captured than other traditional CFD techniques, such as Reynolds Averaged Navier-Stokes. However, in order the LES predictions to be accurate, in addition to the required numerical accuracy of the solvers and the effect of sub-grid scale (SGS) models, the mesh dependence needs to be addressed when the mesh refinement is not enough due to limited computing resources. This work uses as the basis for our analysis fuel spray simulations of n-dodecane under non-reacting conditions injected in a high pressure, high temperature constant chamber known as "Spray A". Although previous works have presented the effect the grid has on the accuracy of the results based on "trial and error" basis, no insight of the dynamics of each phase was provided in the same conditions under different grids. In our work the novelty lies in the fact that the observed trends of each phase regarding to the mesh size are explained based on the code numerics and linked to the physics of the flow. It aims to improve the understanding of the role of mesh refinement in multiphase coupling characteristics and to provide a guideline for mesh resolution requirements of high speed evaporating sprays within LES/Eulerian Lagrangian approaches.

Original languageEnglish
Publication statusPublished - 26 Jul 2018
EventICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems - University of Illinois, Chicago, United States
Duration: 22 Jul 201826 Jul 2018

Conference

ConferenceICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems
CountryUnited States
CityChicago
Period22/07/1826/07/18

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  • Cite this

    Li, C., Crua, C., Morgan, R., & Vogiatzaki, K. (2018). Assessment of the grid requirements for the modelling of the dynamics of high speed evaporating sprays using LES / Eulerian-Lagrangian frameworks. Paper presented at ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems, Chicago, United States.