Wind Tunnel Experiments on Wakes in Stratified Flow Including Modeling Criteria and Development of Experimental Equipment
Wind Tunnel Experiments on Wakes in Stratified Flow Including Modeling Criteria and Development of Experimental Equipment

Author: Gordon H. Strom

Publisher:

Published: 1976

Total Pages: 71

ISBN-13:

DOWNLOAD EBOOK

Wind tunnel experiments were conducted on dimensions of the turbulent wake from an 8 inch disk model in thermally stratified flow. Results were interpreted in terms of densimetric Froude number as the modeling criterion. The substantial agreement with reported hydrodynamic experiments shows the potential for using wind tunnels to study submarine wakes in stratified flow. An additional modeling criterion for vertical density gradient based on momentum flux may be important for momentumless wakes. Development of experimental equipment needed to obtain uniform wind tunnel airstreams at very low speeds with thermal stratification is described. (Author).

The Resonant Interaction of a Submarine's Wake with a Stratified Fluid
The Resonant Interaction of a Submarine's Wake with a Stratified Fluid

Author: Joseph A. Kowalewski

Publisher:

Published: 1993

Total Pages: 65

ISBN-13:

DOWNLOAD EBOOK

Through the use of asymptotic and perturbation methods, this thesis presents a theoretical study of the flow of a stratified fluid over variable topography as a model of the resonant interaction of a submarine's wake with a stratified fluid. Such resonant interactions may be able to produce significant upstream disturbances. The long time solution obtained in our model exhibits growth in time for the resonant case, indicating that perhaps nonlinear effects, balanced by dispersion, could allow the possibility of detecting a submarine by the internal waves its wake generates in the resonant case.

A Phenomenological Model for the Momentumless Turbulent Wake in a Stratified Medium
A Phenomenological Model for the Momentumless Turbulent Wake in a Stratified Medium

Author: D. R. S. Ko

Publisher:

Published: 1973

Total Pages: 53

ISBN-13:

DOWNLOAD EBOOK

The growth and collapse of the turbulent wake behind a submarine in a stratified ocean is studied analytically using simple phenomenological models. The present analysis closely follows a previous integral approach based on the concept of local similarity and turbulent entrainment. A nonuniform entrainment rate, obtained by considering the three turbulent velocity components separately, marks the main difference to the previous approach. The present analysis is limited to a wake without swirl and does not include the energy leakage through the internal wave field.