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

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Doan, Nguyen Anh Khoa  ORCID logo  https://orcid.org/0000-0002-9890-3173
Swaminathan, Nedunchezhian 
Pope, Stephen B 

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.

Description

Keywords

4012 Fluid Mechanics and Thermal Engineering, 4007 Control Engineering, Mechatronics and Robotics, 40 Engineering

Journal Title

Physical Review Fluids

Conference Name

Journal ISSN

2469-990X
2469-990X

Volume Title

3

Publisher

American Physical Society
Sponsorship
European Commission Horizon 2020 (H2020) Industrial Leadership (IL) (686332)
EPSRC (1567652)
Engineering and Physical Sciences Research Council (EP/I027556/1)