Accession Number:

ADA214122

Title:

Direct Numerical Simulation of Aerodynamic Noise

Descriptive Note:

Annual progress rept. no. 1

Corporate Author:

STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING

Report Date:

1989-09-29

Pagination or Media Count:

39.0

Abstract:

Direct Numerical Simulation of Aerodynamic Noise is a part of an overall research program in compressible turbulence including the study of the physics of compressible turbulence, shock-turbulence interactions, reacting flows with heat release, and aerodynamic sound generation in shear flows. The objective of the work in aerodynamic sound generation is to use direct numerical simulations as a tool to study the noise generation processes directly, specifically answer the following questions 1. Can one relate particular flow regions and events to the far-field noise 2. What regions are the dominant contributors to the far-field noise 3. What is the role played by pairing process in noise generation 4. How important are the small scales to the noise generation 5. What processes control the far-field directivity pattern To answer these questions in shear flows, first study the acoustics of simple building block flows. The discussion below presents recent results obtained for one of the building block flows, the scattering of sound by a vortex. A short discussion of numerical accuracy is also given. Finally, results are presented for aerodynamic sound generation from a 2-d temporal mixing-layer. jhd

Subject Categories:

  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE