Time-resolved, aero-optical measurements of a wavefront aberrated by a compressible free shear layer

1995 ◽  
Author(s):  
Ronald Hugo ◽  
Eric Jumper ◽  
George Havener ◽  
Chip Stepanek
Keyword(s):  
Shear Layer ◽  
Optical Measurements ◽  
Free Shear Layer ◽  
Time Resolved

Time-resolved wave front measurements through a compressible free shear layer

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 671-677
Author(s):  
Ronald J. Hugo ◽  
Eric J. Jumper ◽  
George Havener ◽  
Chip Stepanek
Keyword(s):  
Shear Layer ◽  
Wave Front ◽  
Free Shear Layer ◽  
Time Resolved

Time-Resolved Wave Front Measurements Through a Compressible Free Shear Layer

AIAA Journal ◽  
10.2514/2.156 ◽  
1997 ◽  
Vol 35 (4) ◽  
pp. 671-677 ◽  
Author(s):  
Ronald J. Hugo ◽  
Eric J. Jumper ◽  
George Havener ◽  
Chip Stepanek
Keyword(s):  
Shear Layer ◽  
Wave Front ◽  
Free Shear Layer ◽  
Time Resolved

Deformable bubbles in a free shear layer

1997 ◽  
Vol 23 (5) ◽  
pp. 977-1001 ◽  
Author(s):  
E. Loth ◽  
M. Taeibi-Rahni ◽  
G. Tryggvason
Keyword(s):  
Shear Layer ◽  
Free Shear Layer

Assessment of turbulence models using DNS data of compressible plane free shear layer flow

2021 ◽  
Vol 931 ◽  
Author(s):  
D. Li ◽  
J. Komperda ◽  
A. Peyvan ◽  
Z. Ghiasi ◽  
F. Mashayek
Keyword(s):  
Shear Layer ◽  
Compressible Flows ◽  
Eddy Viscosity ◽  
Turbulence Models ◽  
Correlation Coefficients ◽  
Free Shear Layer ◽  
Smagorinsky Model ◽  
Reynolds Analogy ◽  
Velocity Fluctuations ◽  
Scale Similarity

The present paper uses the detailed flow data produced by direct numerical simulation (DNS) of a three-dimensional, spatially developing plane free shear layer to assess several commonly used turbulence models in compressible flows. The free shear layer is generated by two parallel streams separated by a splitter plate, with a naturally developing inflow condition. The DNS is conducted using a high-order discontinuous spectral element method (DSEM) for various convective Mach numbers. The DNS results are employed to provide insights into turbulence modelling. The analyses show that with the knowledge of the Reynolds velocity fluctuations and averages, the considered strong Reynolds analogy models can accurately predict temperature fluctuations and Favre velocity averages, while the extended strong Reynolds analogy models can correctly estimate the Favre velocity fluctuations and the Favre shear stress. The pressure–dilatation correlation and dilatational dissipation models overestimate the corresponding DNS results, especially with high compressibility. The pressure–strain correlation models perform excellently for most pressure–strain correlation components, while the compressibility modification model gives poor predictions. The results of an a priori test for subgrid-scale (SGS) models are also reported. The scale similarity and gradient models, which are non-eddy viscosity models, can accurately reproduce SGS stresses in terms of structure and magnitude. The dynamic Smagorinsky model, an eddy viscosity model but based on the scale similarity concept, shows acceptable correlation coefficients between the DNS and modelled SGS stresses. Finally, the Smagorinsky model, a purely dissipative model, yields low correlation coefficients and unacceptable accumulated errors.

CFD analysis of free shear layer approximations for a pulsed air jet

2014 ◽  
Vol 43 ◽  
pp. 49-58
Author(s):  
Nawel Khaldi ◽  
Salwa Marzouk ◽  
Hatem Mhiri ◽  
Philippe Bournot
Keyword(s):  
Shear Layer ◽  
Cfd Analysis ◽  
Free Shear Layer ◽  
Air Jet
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