Analytical Modeling of Random Thermal Fluctuations in the NORDA High-Frequency Sound Scattering Facility

摘要

An analytical study is presented of the laminar and turbulent flow fields that result from natural convetion 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 convention that may be pertinent to understanding of turbulent flows created in situations analogous to the NORDA high-frequency scattering facility. Key topics include buoyance, heat transfer, boundary layers, and instability.