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Characterizing the Flow Instability in Shockwave and Turbulent Boundary Layer Interactions

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Technical Report,15 Aug 2015,14 Aug 2018

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University of Maryland, College Park College Park United States

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The effort described here provides accurate in time and three-dimensional space datasets and analyses of attached and separated shock and turbulent boundary layer interactions at Mach numbers 3 to 10. In particular 1 The scaling of the separation size was found to have a dependence on Reynolds number that prevents the collapse of the data on previously proposed scaling. Our understanding of the low-frequency physics supports the Reynolds number trend and shows promise of a data collapse. 2 The visualization of time- and space- accurate fields show how the induced flow mixing by large, long, streamwise aligned vortex pairs cause the cycle of depletion andreplenishment of the separated region at low-frequency. 3 The large-eddy simulation of these flows at high Mach numbers requires models that are not purely dissipative and that can account for the conservative exchange of turbulent energy, i.e. simple eddy viscosity models are not good enough. 4 The STBLI database allows us to study shear layers at highly convective numbers and to provide shear layer statistics at those conditions for the first time. Others significant and relevant accomplishments are detailed for shock and isotropic turbulence interactions.

Subject Categories:

  • Fluid Mechanics
  • Fluid Mechanics

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