Direct simulation of a supersonic round turbulent shear layer

J. B. Freund, S. K. Lele, P. Moin

Research output: Contribution to conferencePaperpeer-review


A temporally developing turbulent round mixing layer at Mach number Mj = 1.92 has been simulated and results compared to a similar nearly incompressible simulation at Mj = 0.4. The supersonic mixing layer growth rate, denned with a δ99 thickness parameter, is found to be suppressed relative to its low Mach number counterpart. The Reynolds stresses in the supersonic flow are also suppressed in a manner similar to experimental results. Flow visualization, one dimensional energy spectra, and two point correlations indicate that a realistic turbulent flow is being simulated. At a given thickness in the development of the two mixing layers, the mean velocity, mean temperature, Reynolds stresses, Reynolds shear stress anisotropy, pressure fluctuations, budgets of Reynolds stresses and turbulent kinetic energy are compared. It is found that even though maximum turbulent Mach number reaches. 43 in the compressible case, dilatational effects are minimal and the total viscous dissipation is nearly the same fraction of the production of turbulent kinetic energy for both flows. Pressure fluctuations are significantly suppressed in the supersonic case.

Original languageEnglish (US)
StatePublished - 1997
Externally publishedYes
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997


Other35th Aerospace Sciences Meeting and Exhibit, 1997
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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