Development of a numerical tow tank with wave generation to supplement experimental efforts
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Authors
Jones, Leo M.
Subjects
numerical wave generation
wedge-shaped wave maker
computational fluid dynamics
CFD
loads on near-surface submerged body
wedge-shaped wave maker
computational fluid dynamics
CFD
loads on near-surface submerged body
Advisors
Kwon, Young
Klamo, Joseph
Date of Issue
2017-12
Date
Dec-17
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
This research investigates the capability of computational fluid dynamics to accurately model the performance of a vertically oscillating wave-generating wedge and resultant wave-induced loads on a submerged object in a tow tank. Specifically, the wave height, wave frequency, and unsteady forces on a submerged body were determined from numerous simulations and compared to experimentally measured data from nearly identical conditions as the simulations. Time histories of the water surface elevation were experimentally measured at various fixed locations in the tank to characterize the wave propagation. Once the wave environment was verified as being accurately captured, a fully submerged body was included in the experimental and simulated tanks. Identical waves were generated in both the physical and numerical environments, and passed over a square cross section submerged body that was located near-surface. The experimentally measured and numerically simulated unsteady forces and moments on the body were compared. The model captured loads experienced by the body quite accurately at low wavelengths, yet overestimated loads at higher wavelengths. Future studies should further refine simulation mesh resolution and investigate loads experienced by different geometries at a variety of depths to better understand over-prediction at large wavelengths.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
Sponsors
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Format
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.