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  • Access by Xinjiang University

Study of subgrid-scale velocity models for reacting and nonreacting flows

I. Langella*, N. A. K. Doan, and N. Swaminathan

S. B. Pope

  • Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom

  • Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA

  • *il246@cam.ac.uk

Phys. Rev. Fluids 3, 054602 – Published 4 May, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.054602

Abstract

A study is conducted to identify advantages and limitations of existing large-eddy simulation (LES) closures for the subgrid-scale (SGS) kinetic energy using a database of direct numerical simulations (DNS). The analysis is conducted for both reacting and nonreacting flows, different turbulence conditions, and various filter sizes. A model, based on dissipation and diffusion of momentum (LD-D model), is proposed in this paper based on the observed behavior of four existing models. Our model shows the best overall agreements with DNS statistics. Two main investigations are conducted for both reacting and nonreacting flows: (i) an investigation on the robustness of the model constants, showing that commonly used constants lead to a severe underestimation of the SGS kinetic energy and enlightening their dependence on Reynolds number and filter size; and (ii) an investigation on the statistical behavior of the SGS closures, which suggests that the dissipation of momentum is the key parameter to be considered in such closures and that dilatation effect is important and must be captured correctly in reacting flows. Additional properties of SGS kinetic energy modeling are identified and discussed.

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