Instability and sound emission from a flow over a curved surface

L. Maestrello, P. Parikh, A. Bayliss

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The growth and decay of a wavepacket convecting in a boundary layer over a concave-convex surface is studied numerically using direct computations of the Navier-Stokes equations. The resulting sound radiation is computed using the linearized Euler equations with the pressure from the Navier-Stokes solution as a time-dependent boundary condition. It is shown that on the concave portion the amplitude of the wavepacket increases and its bandwidth broadens while on the convex portion some of the components in the packet are stabilized. The pressure field decays exponentially away from the surface and then algebraically exhibiting a decay characteristic of acoustic waves in two dimensions. The far field acoustic pressure exhibits a peak at a frequency corresponding to the inflow instability frequency.

Original languageEnglish (US)
Pages (from-to)538-544
Number of pages7
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume110
Issue number4
DOIs
StatePublished - Oct 1988

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

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