Optimal control of free shear flow noise

M. Wei, J. B. Freund

Research output: Contribution to conferencePaperpeer-review


Efforts to diagnose and control aerodynamic noise from turbulent flows have been hampered by a lack of the necessary computational fidelity and practical simulation procedures to use in place of expensive trial-and-error experiments. Recent direct numerical simulations of jet noise1 provide a detailed look at the mechanisms, but have not yet shown a clear path to follow that will reduce noise. In this paper we introduce a method that uses the full flow field information of such a simulation in an automated fashion in conjunction with solutions of the adjoint of the flow equations to reduce noise. We demonstrate this method on a convective Mach number Mc = 0.4, Reynolds number Reω = 500 two-dimensional mixing layer. For now, the actuation is right-hand-side forcing of the Navier-Stokes equations restricted to a small control region near the splitter plate. After 7 conjugate gradient iterations, noise is reduced by 6.3dB. The optimal forcing identified is weak, and has a nearly imperceptable effect on the structures in the mixing layer.

Original languageEnglish (US)
StatePublished - 2002
Externally publishedYes
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: Jan 14 2002Jan 17 2002


Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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