scholarly journals Rapid distortion theory for compressible homogeneous turbulence under isotropic mean strain

1996 ◽  
Vol 8 (10) ◽  
pp. 2692-2705 ◽  
Author(s):  
G. A. Blaisdell ◽  
G. N. Coleman ◽  
N. N. Mansour
Keyword(s):  
Homogeneous Turbulence ◽  
Rapid Distortion Theory ◽  
Mean Strain

The distortion of turbulence by irrotational plane strain

1968 ◽  
Vol 32 (4) ◽  
pp. 657-673 ◽  
Author(s):  
H. J. Tucker ◽  
A. J. Reynolds
Keyword(s):  
Plane Strain ◽  
Strain Ratio ◽  
Equilibrium Structure ◽  
Turbulence Energy ◽  
Grid Turbulence ◽  
Rapid Distortion Theory ◽  
Degree Of Anisotropy ◽  
The Individual ◽  
Mean Strain

The experiments reported here extend those of Townsend which form the basis of his model of free turbulence. Here straining is carried to a strain ratio of 6:1, while Townsend's straining went only to 4:1. Two kinds of distorting ducts are used to produce the uniform mean strain applied to initially nearly isotropic grid turbulence.The results differ from Townsend's in that: (i) a considerably higher degree of anisotropy is achieved, Townsend's measure of anisotropy attaining values up to 0·6, rather than the maximum of 0·42 he found; (ii) there is no evidence that an equilibrium structure is attained; and (iii) the strained turbulence rapidly becomes less anisotropic when the straining ceases.It is found to be possible to predict the variation of the total turbulence energy using rapid-distortion theory with a correction for decay. However, the individual components cannot be accurately predicted in this way.

Useful formulas in the rapid distortion theory of homogeneous turbulence

1986 ◽  
Vol 29 (10) ◽  
pp. 3471 ◽  
Author(s):  
Moon J. Lee ◽  
Ugo Piomelli ◽  
William C. Reynolds
Keyword(s):  
Homogeneous Turbulence ◽  
Rapid Distortion Theory

Rapid distortion theory analysis on the interaction between homogeneous turbulence and a planar shock wave

2016 ◽  
Vol 802 ◽  
pp. 108-146 ◽  
Author(s):  
T. Kitamura ◽  
K. Nagata ◽  
Y. Sakai ◽  
A. Sasoh ◽  
Y. Ito
Keyword(s):  
Shock Wave ◽  
Wave Interaction ◽  
Direct Consequence ◽  
Homogeneous Turbulence ◽  
Rapid Distortion Theory ◽  
Hugoniot Relation ◽  
Planar Shock ◽  
Planar Shock Wave ◽  
The One ◽  
High Wavenumbers

The interactions between homogeneous turbulence and a planar shock wave are analytically investigated using rapid distortion theory (RDT). Analytical solutions in the solenoidal modes are obtained. Qualitative answers to unsolved questions in a report by Andreopoulos et al. (Annu. Rev. Fluid Mech., vol. 524, 2000, pp. 309–345) are provided within the linear theoretical framework. The results show that the turbulence kinetic energy (TKE) is increased after interaction with a shock wave and that the contributions to the amplification can be interpreted primarily as the combined effect of shock-induced compression, which is a direct consequence of the Rankine–Hugoniot relation, and the nonlinear effect, which is an indirect consequence of the Rankine–Hugoniot relation via the perturbation manner. For initial homogeneous axisymmetric turbulence, the amplification of the TKE depends on the initial degree of anisotropy. Furthermore, the increase in energy at high wavenumbers is confirmed by the one-dimensional spectra. The enstrophy is also increased; its increase is more significant than that of the TKE because of the significant increase in enstrophy at high wavenumbers. The vorticity components perpendicular to the shock-induced compressed direction are amplified more than the parallel vorticity component. These results strongly suggest that a high resolution is needed to obtain accurate results for the turbulence–shock-wave interaction. The integral length scales ($L$) and the Taylor microscales ($\unicode[STIX]{x1D706}$) are decreased for most cases after the interaction. However, $L_{22,3}(=\,L_{33,2})$ and $\unicode[STIX]{x1D706}_{22,3}(=\,\unicode[STIX]{x1D706}_{33,2})$ are amplified. Here, the subscripts 2 and 3 indicate the perpendicular components relative to the shock-induced compressed direction. The dissipation length and TKE dissipation rate are amplified.

Large eddy simulation of aircraft wake vortices within homogeneous turbulence - Crow instability

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 292-300 ◽  
Author(s):  
Jongil Han ◽  
Yuh-Lang Lin ◽  
David G. Schowalter ◽  
S. P. Arya ◽  
Fred H. Proctor
Keyword(s):  
Large Eddy Simulation ◽  
Homogeneous Turbulence ◽  
Wake Vortices ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Aircraft Wake ◽  
Crow Instability
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