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An LES turbulent inflow generator using a recycling and rescaling method

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journal contribution
posted on 02.11.2016, 11:22 by Feng Xiao, Mehriar Dianat, Jim McGuirk
The present paper describes a recycling and rescaling method for generating turbulent inflow conditions for Large Eddy Simulation. The method is first validated by simulating a turbulent boundary layer and a turbulent mixing layer. It is demonstrated that, with input specification of mean velocities and turbulence rms levels (normal stresses) only, it can produce realistic and self-consistent turbulence structures. Comparison of shear stress and integral length scale indicates the success of the method in generating turbulent 1-point and 2-point correlations not specified in the input data. With the turbulent inlet conditions generated by this method, the growth rate of the turbulent boundary/mixing layer is properly predicted. Furthermore, the method can be used for the more complex inlet boundary flow types commonly found in industrial applications, which is demonstrated by generating non-equilibrium turbulent inflow and spanwise inhomogeneous inflow. As a final illustration of the benefits brought by this approach, a droplet-laden mixing layer is simulated. The dispersion of droplets in the near-field immediately downstream of the splitter plate trailing edge where the turbulent mixing layer begins is accurately reproduced due to the realistic turbulent structures captured by the recycling/rescaling method.

Funding

The work was supported by Rolls-Royce-EPSRC Dorothy Hodgkin Postgraduate Award and National Natural Science Foundation of China (Grant Nos. 11402298, 11472303, and 51406233). The simulations were run on Tianhe-1A of National Supercomputing Center in Changsha in China.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Flow, Turbulence and Combustion

Pages

1 - 33

Citation

XIAO, F., DIANAT, M. and MCGUIRK, J.J., 2016. An LES turbulent inflow generator using a recycling and rescaling method. Flow, Turbulence and Combustion, 98 (3), pp. 663–695.

Publisher

Springer Verlag © The Author(s)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

24/09/2016

Publication date

2016

Notes

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

ISSN

1573-1987

Language

en