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Title: An LES turbulent inflow generator using a recycling and rescaling method
Authors: Xiao, Feng
Dianat, Mehriar
McGuirk, James J.
Keywords: Turbulent inflow generator
Recycling
Rescaling
Turbulent mixing layer
Droplet dispersion
Issue Date: 2016
Publisher: Springer Verlag © The Author(s)
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.
Abstract: 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.
Description: 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.
Sponsor: 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.
Version: Published
DOI: 10.1007/s10494-016-9778-6
URI: https://dspace.lboro.ac.uk/2134/23019
Publisher Link: http://dx.doi.org/10.1007/s10494-016-9778-6
ISSN: 1573-1987
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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