Abstract
The physics of atomization process involves many spatial scales, generating a wide variety of liquid inclusions of different sizes with large density and viscosity ratios between liquid and gas phases. To correctly capture the dynamics of these phenomena, each scale should be resolved with an appropriate method to ensure the conservation of physical quantities (mass, momentum) as well as the jump conditions across the liquid-gas interface. To address these problems, an original multi-scale methodology has been developed. It consists of a core coupled Level set/Volume of Fluid method (CLSVOF) for accurate capture of primary atomization, an adaptive mesh refinement technique (oct-tree AMR) to dynamically optimize the structured Cartesian mesh and a particle tracking algorithm to capture droplet dynamics. An improved Eulerian-Lagrangian coupling has been developed to assure a smooth transition between the Eulerian and the Lagrangian modelling of the droplets, where both methods approach their design limits. Results show its ability to reproduce the whole atomization process, from large scale instabilities to small droplet dynamics.
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Notes
- 1.
In the application foreseen in this paper, the one way approach is considered as sufficient, even if the small droplets can in practice have almost the size of the cell.
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Acknowledgements
The PARAMESH software used in this work was developed under NASA’s HPCC and ESTO/CT projects and under grant NNG04GP79G from the NASA/AISR project. The present study has been granted by the Foundation STAE-RTRA-research program COFFECI. This work was granted access to the HPC resources of CINES under the allocation 2015-x20142b7264 made by GENCI.
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Estivalèzes, J.L., Zuzio, D., DiPierro, B. (2018). An Improved Multiscale Eulerian-Lagrangian Method for Simulation of Atomization Process. In: Deville, M., et al. Turbulence and Interactions. TI 2015. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 135. Springer, Cham. https://doi.org/10.1007/978-3-319-60387-2_6
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DOI: https://doi.org/10.1007/978-3-319-60387-2_6
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