A new idea to predict reshocked Richtmyer-Meshkov mixing: constrained large-eddy simulation

Bin, Yuanwei1; Xiao, Mengjuan2; Shi, Yipeng1,3,4; Zhang, Yousheng2,3,4; Chen, Shiyi1,5

2021-05-11

10.1017/jfm.2021.332

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

The reshocked turbulent Richtmyer-Meshkov (RM) mixing of two media is the most representative problem of more general and complex turbulent mixing induced by interfacial instabilities, broadly occurring in both nature and engineering applications. An accurate prediction of its evolving of spatial structure and mixing width (MW) is of fundamental importance. However, satisfactory prediction with the large-eddy simulation (LES) has not yet been achieved, even for the most important MW. In this paper, we innovatively solve this problem by combining the idea of the constrained large-eddy simulation (CLES), which succeeded previously only in classical single-medium turbulence, and our recently developed Reynolds averaged Navier-Stokes (RANS) model, which realized a satisfactory prediction of MW. Specifically, in our currently developed CLES model, with the aid of Reynolds decomposition, the unclosed subgrid scale (SGS) LES model is decomposed into two parts, i.e. the averaged and the fluctuating. The averaged part is dominated and modelled by the counterpart of our recently developed RANS model to accurately predict the MW, while the fluctuating part is modelled with the classical Smagorinsky model. Consequently, besides successfully capturing the three-dimensional large-scale structure of turbulence and the evolution of the (normalized) mixed mass, our newly proposed CLES also predicts a satisfactory MW with a very coarse grid. To the best of our knowledge, this is the first time that the LES can yield such a comparable result with experiment.

shock waves turbulent mixing turbulence modelling

SCI ; EI

英语

其他

National Natural Science Foundation of China (NSFC)[91752202,11972093,12002059]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000648988900001

CAMBRIDGE UNIV PRESS

20212010358785

Forecasting ; Mixing ; Navier Stokes equations ; Turbulence

Fluid Flow:631 ; Chemical Operations:802.3 ; Mathematics:921 ; Calculus:921.2

ENGINEERING

Web of Science

1.Peking Univ, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
2.Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China
3.Peking Univ, HEDPS, Ctr Appl Phys & Technol, Beijing 100871, Peoples R China
4.Peking Univ, Coll Engn, Beijing 100871, Peoples R China
5.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China

Bin, Yuanwei,Xiao, Mengjuan,Shi, Yipeng,et al. A new idea to predict reshocked Richtmyer-Meshkov mixing: constrained large-eddy simulation[J]. JOURNAL OF FLUID MECHANICS,2021,918.

Bin, Yuanwei,Xiao, Mengjuan,Shi, Yipeng,Zhang, Yousheng,&Chen, Shiyi.(2021).A new idea to predict reshocked Richtmyer-Meshkov mixing: constrained large-eddy simulation.JOURNAL OF FLUID MECHANICS,918.

Bin, Yuanwei,et al."A new idea to predict reshocked Richtmyer-Meshkov mixing: constrained large-eddy simulation".JOURNAL OF FLUID MECHANICS 918(2021).