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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v26.i1.20
pages 17-35

Direct Simulation of Low-Reynolds Number Supersonic Wall-Shear Layers II: Statistical Analysis and Energy Budgets

Ferhat F. Hatay
University of Colorado at Boulder, Boulder, Colorado 80309 ; University of Miami, Coral Gables, FL 33124, USA
Sedat Biringen
University of Colorado at Boulder, Boulder, Colorado 80309

RESUMO

In this paper, one- and two-dimensional two-point (double) correlations from an existing data base for a compressible turbulent shear-layer flow are presented and discussed; computational results are compared with incompressible and compressible turbulent boundary layer experiments. Quantitative comparisons are done by using the one-dimensional correlation tensor whereas two-dimensional correlation data are studied qualitatively to establish the similarities and the differences between compressible and incompressible wall-shear layer flows. A key aspect in the direct numerical simulations of turbulent flows, the adequacy of the extent of the computational domain, is also assessed through the inspection of the correlation distributions.
The focus of this work is to explore the paths of energy transfer through which compressible turbulence is sustained. The structural similarities and differences between the incompressible and compressible turbulence are also investigated. The energy flow patterns or energy cascades are found to be directly related to the evolution of vortical structures which are generated in the near-wall region. Near-wall structures, and mechanisms which are not readily accessible through physical experiments are analyzed and their critical role on the evolution and the behavior of the flow is documented extensively.


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