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Urans V&V for KCS Free Running Cours...

Kim, Dong-Hwan.

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Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves./
Author:	Kim, Dong-Hwan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	170 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Contained By:	Dissertations Abstracts International81-04B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13425805
ISBN:	9781085758253

Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves.
Kim, Dong-Hwan.

Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 170 p.

Source: Dissertations Abstracts International, Volume: 81-04, Section: B.

Thesis (Ph.D.)--The University of Iowa, 2019.

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

The capability of CFD is assessed by utilizing CFDShip-Iowa V4.5 for the prediction of the 6DOF motion responses, forces, moments and the local flow field of the 2.7m KCS model in various weather/operating conditions. The discretized propeller is preferred and the rudder is designed to be active up to ±35 degrees. Grid triplets are generated with the refinement ratio √2 and verification is achieved for the resistance and propeller open water tests while for the other tests is only partially fulfilled. The verification shows unsmooth convergence, however, the errors from grid triplets are small. The propeller open water test validates the performance of the discretized propeller successfully. The free decay tests could predict reasonable heave/pitch/roll natural frequencies. The resistance test verifies the nominal wake distribution. The self-propulsion test using discretized propeller shows 18% higher propeller inflow and 0.1 thrust deduction factor compared to resistance test. A propeller blade that sweeps the starboard experienced higher thrust inducing non-axisymmetric propeller wake and thus affecting the angle of attack of the rudder. Neutral rudder angle diminishes effective angle of attack and keeps the course straight. Maneuvering simulations could predict qualitatively good agreement for validation variables while the trajectory needs more improvement. Using the discretized propeller for the head/oblique wave course-keeping simulations achieved validation successfully. The RAO of added thrust, torque and propeller rotational speed resembles the RAO of added-resistance except showing larger values during long waves. The mean propeller efficiency is at the minimum when the ship experiences a resonance. The first harmonic amplitude of the propeller efficiency increases followed by the increase of the wavelength.

ISBN: 9781085758253Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Added powering

Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves.
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020 $a 9781085758253
035 $a (MiAaPQ)AAI13425805
035 $a AAI13425805
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100 1 $a Kim, Dong-Hwan. $3 3558660
245 1 0 $a Urans V&V for KCS Free Running Course Keeping and Maneuvering Simulations in Calm Water and Regular Head/Oblique Waves.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 170 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisor: Stern, Frederick;Sanada, Yugo.
502 $a Thesis (Ph.D.)--The University of Iowa, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a The capability of CFD is assessed by utilizing CFDShip-Iowa V4.5 for the prediction of the 6DOF motion responses, forces, moments and the local flow field of the 2.7m KCS model in various weather/operating conditions. The discretized propeller is preferred and the rudder is designed to be active up to ±35 degrees. Grid triplets are generated with the refinement ratio √2 and verification is achieved for the resistance and propeller open water tests while for the other tests is only partially fulfilled. The verification shows unsmooth convergence, however, the errors from grid triplets are small. The propeller open water test validates the performance of the discretized propeller successfully. The free decay tests could predict reasonable heave/pitch/roll natural frequencies. The resistance test verifies the nominal wake distribution. The self-propulsion test using discretized propeller shows 18% higher propeller inflow and 0.1 thrust deduction factor compared to resistance test. A propeller blade that sweeps the starboard experienced higher thrust inducing non-axisymmetric propeller wake and thus affecting the angle of attack of the rudder. Neutral rudder angle diminishes effective angle of attack and keeps the course straight. Maneuvering simulations could predict qualitatively good agreement for validation variables while the trajectory needs more improvement. Using the discretized propeller for the head/oblique wave course-keeping simulations achieved validation successfully. The RAO of added thrust, torque and propeller rotational speed resembles the RAO of added-resistance except showing larger values during long waves. The mean propeller efficiency is at the minimum when the ship experiences a resonance. The first harmonic amplitude of the propeller efficiency increases followed by the increase of the wavelength.
590 $a School code: 0096.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Ocean engineering. $3 660731
650 4 $a Naval engineering. $3 3173824
650 4 $a Fluid mechanics. $3 528155
653 $a Added powering
653 $a CFDShip-IOWA
653 $a Computational fluid dynamics
653 $a KCS
690 $a 0548
690 $a 0547
690 $a 0468
690 $a 0204
710 2 $a The University of Iowa. $b Mechanical Engineering. $3 1683754
773 0 $t Dissertations Abstracts International $g 81-04B.
790 $a 0096
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13425805