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Hydrodynamic Performance of an Unman...

Prasad, Bijoy .

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Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas./
Author:	Prasad, Bijoy .
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	108 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
Contained By:	Dissertations Abstracts International81-08B.
Subject:	Ocean engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27663997
ISBN:	9781392749203

Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas.
Prasad, Bijoy .

Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 108 p.

Source: Dissertations Abstracts International, Volume: 81-08, Section: B.

Thesis (Ph.D.)--Florida Atlantic University, 2019.

This item must not be sold to any third party vendors.

This study analyzes the hydrodynamic performance of an advanced catamaran vehicle using computational fluid dynamics (CFD) simulations and experimental testing data in support of system identification and development of a physics-based control system for unmanned surface vehicle (USV) operations in coastal waters. A series of steps based on increasing complexity are considered sequentially in this study. First the steady flow past the static vehicle, then the vehicle with a fixed orientation advancing in calm water, and finally the vehicle moving with two degrees of freedom (DOF) in calm water as well as head seas.The main objective of the study is to assess the role of general multiphase unsteady Reynolds Averaged Navier Stokes (RANS) as a predictive tool for the hydrodynamic performance of an USV. A parametric analysis of the vehicle performance at different Froude number and wave steepness in shallow waters is conducted. The characteristics of the wave resistance, heaving and pitching motion, wave-hull interactions, and free surface flow patterns are investigated. The study will aid in the design of a robust physics-based control system for the vehicle and provide a tool for prediction of its performance.ANSYS Fluent is used to carry out the numerical simulations of the surface vehicle and the computations are conducted using finite volume discretization to solve the equations of fluid motion. The interface capturing volume of fluid (VOF) method is applied to analyze the free surface wave systems around the hulls of the vehicle and the realizable k-ε turbulence model is used to take account of the effects of turbulence. The dynamic mesh method is executed to update the mesh and the user defined function (UDF) is dynamically linked to define the grid motions. The numerical results for flow resistance are found to be in good agreement with the experiments, suggesting that the application of the CFD methodology developed here is appropriate for predicting the hydrodynamic performance of the vehicle in shallow waters, including the effect of head seas.

ISBN: 9781392749203Subjects--Topical Terms:

660731
Ocean engineering.
Subjects--Index Terms:

CFD

Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas.
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245 1 0 $a Hydrodynamic Performance of an Unmanned Catamaran Vehicle in Head Seas.
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300 $a 108 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
500 $a Advisor: Dhanak, Manhar.
502 $a Thesis (Ph.D.)--Florida Atlantic University, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a This study analyzes the hydrodynamic performance of an advanced catamaran vehicle using computational fluid dynamics (CFD) simulations and experimental testing data in support of system identification and development of a physics-based control system for unmanned surface vehicle (USV) operations in coastal waters. A series of steps based on increasing complexity are considered sequentially in this study. First the steady flow past the static vehicle, then the vehicle with a fixed orientation advancing in calm water, and finally the vehicle moving with two degrees of freedom (DOF) in calm water as well as head seas.The main objective of the study is to assess the role of general multiphase unsteady Reynolds Averaged Navier Stokes (RANS) as a predictive tool for the hydrodynamic performance of an USV. A parametric analysis of the vehicle performance at different Froude number and wave steepness in shallow waters is conducted. The characteristics of the wave resistance, heaving and pitching motion, wave-hull interactions, and free surface flow patterns are investigated. The study will aid in the design of a robust physics-based control system for the vehicle and provide a tool for prediction of its performance.ANSYS Fluent is used to carry out the numerical simulations of the surface vehicle and the computations are conducted using finite volume discretization to solve the equations of fluid motion. The interface capturing volume of fluid (VOF) method is applied to analyze the free surface wave systems around the hulls of the vehicle and the realizable k-ε turbulence model is used to take account of the effects of turbulence. The dynamic mesh method is executed to update the mesh and the user defined function (UDF) is dynamically linked to define the grid motions. The numerical results for flow resistance are found to be in good agreement with the experiments, suggesting that the application of the CFD methodology developed here is appropriate for predicting the hydrodynamic performance of the vehicle in shallow waters, including the effect of head seas.
590 $a School code: 0119.
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690 $a 0468
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793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27663997