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Thesis
Multi-scale experimental investigation of the hydrodynamic characteristics of a blunt and streamlined submersible object
University of Iowa
Master of Science (MS), University of Iowa
Autumn 2019
DOI: 10.17077/etd.005239
Abstract
A blunt and streamlined submersible object was experimentally tested in a tow tank and open water channel to measure the hydrodynamic characteristics of its performance. Models were ran at 3 primary speeds, submergences, and size scales to investigate effects on the resistance, seakeeping, and wake flow field of the model. Experimental measurements collected include dynamic forces and torques, pressures, generated wave fields, velocity and vorticity measurements using a Particle Tracking Velocimetry system, point velocity measurements using an Laser Doppler Velocimetry system, and fluorescein dye visualizations.
Objectives for this study are to better understand bluff body flow and potential improvements that can be made to enhance the performance of underwater or surface vessels. Negative characteristics may include unsteady forces causing the vessel to rise or sink, exorbitant drag production near the blunt bow or transom stern which dramatically increase the powering requirements, and unsteady flow structures generated that produce unwanted effects on the body. These issues are improved by attaching streamlined fairings to the front and rear of the model which decrease the large resistance and unsteady forces experienced.
Overall, this study found that the streamlined design produces an overall reduction in resistance and negative flow characteristics given its reduced form drag as opposed to the blunt model. The streamlining allows the flow at the front and rear to naturally follow the body’s curvature and not become trapped in various flow structures such as boundary layer separation or vortexes. Additionally, the streamlined design exhibits improved performance in nearly all other aspects of this research.
Details
- Title: Subtitle
- Multi-scale experimental investigation of the hydrodynamic characteristics of a blunt and streamlined submersible object
- Creators
- Kyle Anthony Mosqueda
- Contributors
- Casey Harwood (Advisor)James Buchholz (Committee Member)Pablo Carrica (Committee Member)Albert Ratner (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Mechanical Engineering
- Date degree season
- Autumn 2019
- Publisher
- University of Iowa
- DOI
- 10.17077/etd.005239
- Number of pages
- xiii, 89 pages
- Copyright
- Copyright 2019 Kyle Mosqueda
- Comment
- This thesis has been optimized for improved web viewing. If you require the original version, contact the University Archives at the University of Iowa: https://www.lib.uiowa.edu/sc/contact/
- Language
- English
- Description illustrations
- illustrations (chiefly color)
- Description bibliographic
- Includes bibliographical references (page 89).
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9983779998602771
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