Interaction of a vortex pair with a free surface : measurements and computations
Loading...
Authors
Suthon, Peter B. R.
Subjects
Surface disturbances
Scars
Striations
Trailing Vortices
Vortex Dynamics
Scars
Striations
Trailing Vortices
Vortex Dynamics
Advisors
Sarpkaya, T.
Date of Issue
1990-06
Date
1990-06
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
An investigation of the interaction of two-counter-rotating vortices with a free surface has been undertaken. Experiments were carried out in two water basins and in a long towing tank through the use of measurements, flow visualization, and an infrared camera. The results have shown that all types of vortex pairs over a wide range of Froude Numbers give rise to three-dimensional surface disturbances, known as scars and striations. The striations are a consequence of the short wavelength instability inherent to the vortex pair itself. The scars are transported outward by the vortex pair and are comprised of a constellation of coherent vortical structures (whirls). The experiments have provided sufficient understanding of the physics of the phenomenon and led to the development of a numerical model based on vortex dynamics. This model proved to be capable of explaining the physical processes involved in the evolution of the three-dimensional footprints of the vortex pair.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Mechanical Engineer
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xi, 123 p. ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.