Abstract
In this article, the unstructured, high order finite-volume CFD solver FLUSEPA, developed by Airbus Safran Launchers, is used to simulate a supersonic coaxial Helium/Air mixing experiment. The aim is to assess the ability of the code to accurately represent mixing in compressible flows and to create a reference case in order to test a future hybrid RANS/LES (HRL) model with variable turbulent Prandtl and Schmidt numbers. Both RANS and HRL simulations are performed and the impact of Lewis number on the results is studied. Fine and coarse meshes are used to see the influence of spatial resolution on modeled and resolved scales. General good agreement is obtained for both RANS and HRL simulations. Predictably, the choice of Lewis numbers has almost no impact on the time-averaged fields of the fine HRL simulation. Its role is more significant on the coarse mesh and the steady RANS simulations.
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Notes
- 1.
Registered trademark in France with number 134009261.
- 2.
Higher priority level meshes overlapping those of lower priority.
- 3.
Monotonic Upstream-Centered Scheme for Conservation Laws.
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It involves several iteration for small cells and few for big ones.
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Thanks to the 4th order local recentering method FLUSEPA can resolve vortices with 6 cells in diameter.
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Similar drops in experimental RMS fluctuations are also visible at \(x=62\) and \(x=102\) mm, not printed on this paper.
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Acknowledgements
We would like to thank Professor Andrew D. Cutler for providing all data and additional details about the experiment.
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Charrier, L., Pont, G., Marié, S., Brenner, P., Grasso, F. (2018). Hybrid RANS/LES Simulation of a Supersonic Coaxial He/Air Jet Experiment at Various Turbulent Lewis Numbers. In: Hoarau, Y., Peng, SH., Schwamborn, D., Revell, A. (eds) Progress in Hybrid RANS-LES Modelling. HRLM 2016. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 137. Springer, Cham. https://doi.org/10.1007/978-3-319-70031-1_28
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