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Boundary layer stabilization via physical and thermodynamic roughness

Francis Lacombe and Jean-Pierre Hickey

  • Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue W., N2L 3G1, Ontario, Canada

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Phys. Rev. Fluids 8, 073901 – Published 12 July, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.073901

Abstract

The coupling effect of physical and thermodynamic wall roughness is investigated using nonlinear parabolized stability equations. A patch of five sinusoidal physical and wall temperature variations, denoted here as roughness, is positioned upstream of the typical transition location of a zero-pressure gradient flat-plate boundary layer at M=0.7. Using only thermodynamic roughness on a flat plate, we note the stabilizing effect of cooling strips, whereas, the heating has a destabilizing effect on the stability of Tollmien-Schlichting waves. The combined effect of physical roughness patch superimposed on the thermodynamic roughness results in a synergetic coupling effect that delays the transition. The addition of sinusoidally varying wall temperature to physical roughness can stabilize the boundary layer through a spectral narrowing of the instability modes and the generation of off-peak frequencies. Thus, the physical roughness with cooling results in a more stable boundary layer compared to cooling alone, a finding that could help improve temperature-based active laminar flow control devices.

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Outline

Information

Phys. Rev. Fluids 8, 073901– Published 12 July, 2023
  • Received 19 December 2022
  • Accepted 20 June 2023
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