ASA 127th Meeting M.I.T. 1994 June 6-10

3aSAa2. Prospects for computational techniques in basic engineering flow noise evaluations.

William K. Blake

Signatures Directorate, David Taylor Model Basin, Code 7023, Bethesda, MD 20084-5000

Advances in computational fluid dynamics techniques for predicting viscous turbulent flows suggest the plausibility for making appropriate extensions to aero- and hydroacoustics. Furthermore, the developments in our understanding of mechanisms of flow-induced sound and vibration over the past 30 years have provided useful insights on how to make these extensions. Using some example problems, this paper will explore how large-scale computation might play useful roles in the modeling of flow sources. Emphasis will be on subsonic sources of flow and vibration. Examples of some numerical modeling requirements for computational solutions for these model cases will be derived from the fundamental theories for these sources and their applications. Suggestions will be made for certain measurement techniques which could provide both code validation and necessary coefficients that may be necessary for empirically based code elements.