Large-Scale Structures in Implicit Large-Eddy Simulation of Compressible Turbulent Flow

2014 ◽  
Author(s):  
Jonathan Poggie
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Large Scale ◽  
Large Scale Structures ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scale Structures ◽  
Compressible Turbulent Flow ◽  
Implicit Large Eddy Simulation

Large Eddy Simulation of Self-Sustained Cavity Oscillation for Subsonic and Supersonic Flows

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
K. M. Nair ◽  
S. Sarkar
Keyword(s):  
Large Eddy Simulation ◽  
Shear Layer ◽  
Acoustic Waves ◽  
Large Scale ◽  
Hydrodynamic Instability ◽  
Supersonic Flows ◽  
Large Scale Structures ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scale Structures

The primary objective is to perform a large eddy simulation (LES) using shear improved Smagorinsky model (SISM) to resolve the large-scale structures, which are primarily responsible for shear layer oscillations and acoustic loads in a cavity. The unsteady, three-dimensional (3D), compressible Navier–Stokes (N–S) equations have been solved following AUSM+-up algorithm in the finite-volume formulation for subsonic and supersonic flows, where the cavity length-to-depth ratio was 3.5 and the Reynolds number based on cavity depth was 42,000. The present LES resolves the formation of shear layer, its rollup resulting in large-scale structures apart from shock–shear layer interactions, and evolution of acoustic waves. It further indicates that hydrodynamic instability, rather than the acoustic waves, is the cause of self-sustained oscillation for subsonic flow, whereas the compressive and acoustic waves dictate the cavity oscillation, and thus the sound pressure level for supersonic flow. The present LES agrees well with the experimental data and is found to be accurate enough in resolving the shear layer growth, compressive wave structures, and radiated acoustic field.

Large eddy simulation of turbulent attached cavitating flow with special emphasis on large scale structures of the hydrofoil wake and turbulence-cavitation interactions

2017 ◽  
Vol 29 (1) ◽  
pp. 27-39 ◽  
Author(s):  
Bin Ji ◽  
Yun Long ◽  
Xin-ping Long ◽  
Zhong-dong Qian ◽  
Jia-jian Zhou
Keyword(s):  
Large Eddy Simulation ◽  
Large Scale ◽  
Cavitating Flow ◽  
Large Scale Structures ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scale Structures

The influence of large-scale structures on entrainment in a decelerating transient turbulent jet revealed by large eddy simulation

2012 ◽  
Vol 24 (4) ◽  
pp. 045106 ◽  
Author(s):  
Bing Hu ◽  
Mark P. B. Musculus ◽  
Joseph C. Oefelein
Keyword(s):  
Large Eddy Simulation ◽  
Large Scale ◽  
Turbulent Jet ◽  
Large Scale Structures ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Scale Structures

Large-eddy simulation of compressible turbulent flow in convergent-divergent nozzles with isothermal wall

2019 ◽  
Vol 78 ◽  
pp. 108425
Author(s):  
Susila Mahapatra ◽  
Akhil Nelaturi ◽  
Tennyson J.A. ◽  
Somnath Ghosh
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Isothermal Wall ◽  
Compressible Turbulent Flow

scholarly journals Large-eddy simulation of large-scale structures in long channel flow

2010 ◽  
Vol 661 ◽  
pp. 341-364 ◽  
Author(s):  
D. CHUNG ◽  
B. J. McKEON
Keyword(s):  
Large Scale ◽  
Small Scale ◽  
Mean Velocity ◽  
Large Scale Structures ◽  
Eddy Simulation ◽  
Filter Width ◽  
Half Height ◽  
Large Eddy ◽  
The Mean ◽  
Scale Structures

We investigate statistics of large-scale structures from large-eddy simulation (LES) of turbulent channel flow at friction Reynolds numbers Reτ = 2K and 200K (where K denotes 1000). In order to capture the behaviour of large-scale structures properly, the channel length is chosen to be 96 times the channel half-height. In agreement with experiments, these large-scale structures are found to give rise to an apparent amplitude modulation of the underlying small-scale fluctuations. This effect is explained in terms of the phase relationship between the large- and small-scale activity. The shape of the dominant large-scale structure is investigated by conditional averages based on the large-scale velocity, determined using a filter width equal to the channel half-height. The conditioned field demonstrates coherence on a scale of several times the filter width, and the small-scale–large-scale relative phase difference increases away from the wall, passing through π/2 in the overlap region of the mean velocity before approaching π further from the wall. We also found that, near the wall, the convection velocity of the large scales departs slightly, but unequivocally, from the mean velocity.

710 Large-Eddy Simulation of Weak Compressible Turbulent Flow around an Airfoil using One-equation Dynamic Model

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _7-10_
Author(s):  
Hideaki YAMASHITA ◽  
Takeo KAJISHIMA ◽  
Takashi OHTA
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Dynamic Model ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Compressible Turbulent Flow

scholarly journals Computing Turbulent Flow Dynamics With Implicit Large Eddy Simulation

2007 ◽  
Vol 129 (12) ◽  
pp. 1481-1482 ◽  
Author(s):  
Fernando F. Grinstein ◽  
Dimitris Drikakis
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Flow Dynamics ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Implicit Large Eddy Simulation

A large eddy simulation approach of compressible turbulent flow without density weighting

2006 ◽  
Vol 18 (11) ◽  
pp. 118101 ◽  
Author(s):  
Xiao-Bo Sun ◽  
Xi-Yun Lu
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Simulation Approach ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Compressible Turbulent Flow ◽  
Density Weighting
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