Accession Number:

ADA142520

Title:

Analytical Modeling of Random Thermal Fluctuations in the NORDA (Naval Ocean Research and Development Activity) High-Frequency Sound Scattering Facility.

Descriptive Note:

Final technical rept. 1 Feb 83-31 Jan 84,

Corporate Author:

PIERCE (ALLAN D) MARIETTA GA

Personal Author(s):

• Pierce,A. D.

Report Date:

1984-05-28

Pagination or Media Count:

79.0

Abstract:

An analytical study is presented of the laminar and turbulent flow fields that result from natural convection created by cooled or heated arrays of tubular elements immersed in water. The study is concerned in particular with the methods used to create turbulence in the NORDA high-frequency sound scattering facility and many numerical results are given that pertain to that application. The report discusses the initially laminar thermal plume that rises from a line source of heat in water, the instability of this plume, the eventual turbulent form of the plume, plume-plume interactions, and the swaying of thermal plumes. An appendix gives a chronological bibliography of works on natural convection that may be pertinent to understanding of turbulent flows created in situations analogous to the NORDA high-frequency scattering facility. Author

Descriptors:

• *ACOUSTIC SCATTERING
• *UNDERWATER SOUND
• HIGH FREQUENCY
• BOUNDARY LAYER
• TURBULENT FLOW
• FLOW FIELDS
• CYLINDRICAL BODIES
• SOUND TRANSMISSION
• PLUMES
• CONVECTION(HEAT TRANSFER)
• LAMINAR FLOW

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE