Development of a unified heuristic model of Fluid turbulence
By: by T.H. Gawain and J.W. Pritchett
Contributors: Pritchett, John W.; Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1971
Place of publication: Monterey, California
Language: eng
Number of pages: 119
Subjects: Turbulence; Viscosity; Fluid dynamics
Description: A unified heuristic model of fluid turbulence is proposed which supplements the basic equations of motion and continuity so as to define determinate solutions under a wide variety of conditions. A single set of equations applies to all cases. Only the boundary conditions change for each application. The Reynolds stresses are related to the mean flow heuristically, through an eddy viscosity. This also involves the turbulent energy, which is analyzed with the aid of empirical expressions for dissipation and diffusion. A characteristic local length scale is introduced, based on a generalization of von Karmon's mixing length. The model is illustrated by application to a channel and a jet. Agreement with experiment is noted. The report also includes an original analysis of the stress/strain rate relation. (Author)
Notes: Title from cover.

"February 1971"--Cover.

"NPS-57GN71021A"--Cover.

DTIC Identifiers: Mixing length, channel flow, turbulent diffusion.

Author(s) key words: Fluid turbulence, scale of turbulence, Eddy viscosity, turbulent jet, turbulent flow, Poiseuille flow, spectrum of turbulence, correlation function, mixing length, turbulent dissipation, turbulent diffusion, turbulent energy, Reynolds stresses.

Includes bibliographical references (p. 96-97)

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1971.