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A Hybrid Computational Framework for...

White, Paul F.

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A Hybrid Computational Framework for the Simulation of Ships Maneuvering In Waves.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Hybrid Computational Framework for the Simulation of Ships Maneuvering In Waves./
作者:	White, Paul F.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	153 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28006612
ISBN:	9798643185215

A Hybrid Computational Framework for the Simulation of Ships Maneuvering In Waves.
White, Paul F.

A Hybrid Computational Framework for the Simulation of Ships Maneuvering In Waves. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 153 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--University of Michigan, 2020.

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

The maneuvering characteristics of a ship directly impact its safety of navigation, economy, environmental impact, and overall operational efficiency. Ships are routinely tasked to perform basic maneuvers that involve turning, stopping and backing, and course keeping. However, vessels also are required to execute challenging maneuvers such as taking evasive action or maintaining course in adverse weather. The performance of the vessel must be adequate in various water depths, in confined or open water, and in a multitude of environmental conditions. While most ship maneuvering analysis has been done in calm water, and seakeeping performance analyzed entirely separately, vessels regularly need to maneuver in a seaway, where wave forces can have an important influence on ship maneuverability. Consequently, predictive tools are necessary in ship design in order to evaluate the maneuvering response of vessels in both calm water and in waves.This thesis formulates a novel computational approach to simulate maneuvering in waves. To resolve wave forces, viscous forces, and propeller forces entirely through use of Computational Fluid Dynamics (CFD) is computationally expensive. The spatial and temporal discretization requirements lead to very large problem sizes that are expensive to solve even with high performance parallel computing. The method proposed here takes a hybrid approach where multiple numerical methods are selected for their strengths and eciencies. A single-phase Reynolds-averaged Navier-Stokes solver is utilized to solve for the slowly-varying viscous-dominated horizontal plane forces common to a ship maneuvering in calm water. A propeller force model is utilized to predict the time-varying propeller loads. The discrete propeller is therefore omitted from the CFD, allowing a significantly larger time step to be taken. The induced velocity from the propeller is introduced into the CFD through a momentum source disk.A linearized time-domain high-order Boundary Element Method (BEM) is used to model all unsteady wave forcing. The time-domain BEM predicts first-order wave forces with zero mean value and second-order forces that are derived from first-order quantities. The second-order wave loads are computed in a postprocessing step after the solution to the first-order seakeeping problem, providing an efficient means of computing wave forces.The proposed hybrid simulation method is tested in two case studies: maneuvering of the Duisburg Test Case hull form and maneuvering of the KRISO Container Ship. The hybrid method is compared to high-fidelity CFD results computed using a two-phase solver with free-surface capturing by the Volume-of-Fluid method. The maneuvering trajectories computed with the hybrid method are found to compare favorably with the nonlinear results produced with the two-phase solver. Moreover, the hybrid simulation method shows (at minimum) a factor of ten reduction in computational cost for all cases tested herein, hence showing promise as an ecient option for simulation of ships maneuvering in waves.

ISBN: 9798643185215Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Maneuvering in waves

A Hybrid Computational Framework for the Simulation of Ships Maneuvering In Waves.
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520 $a The maneuvering characteristics of a ship directly impact its safety of navigation, economy, environmental impact, and overall operational efficiency. Ships are routinely tasked to perform basic maneuvers that involve turning, stopping and backing, and course keeping. However, vessels also are required to execute challenging maneuvers such as taking evasive action or maintaining course in adverse weather. The performance of the vessel must be adequate in various water depths, in confined or open water, and in a multitude of environmental conditions. While most ship maneuvering analysis has been done in calm water, and seakeeping performance analyzed entirely separately, vessels regularly need to maneuver in a seaway, where wave forces can have an important influence on ship maneuverability. Consequently, predictive tools are necessary in ship design in order to evaluate the maneuvering response of vessels in both calm water and in waves.This thesis formulates a novel computational approach to simulate maneuvering in waves. To resolve wave forces, viscous forces, and propeller forces entirely through use of Computational Fluid Dynamics (CFD) is computationally expensive. The spatial and temporal discretization requirements lead to very large problem sizes that are expensive to solve even with high performance parallel computing. The method proposed here takes a hybrid approach where multiple numerical methods are selected for their strengths and eciencies. A single-phase Reynolds-averaged Navier-Stokes solver is utilized to solve for the slowly-varying viscous-dominated horizontal plane forces common to a ship maneuvering in calm water. A propeller force model is utilized to predict the time-varying propeller loads. The discrete propeller is therefore omitted from the CFD, allowing a significantly larger time step to be taken. The induced velocity from the propeller is introduced into the CFD through a momentum source disk.A linearized time-domain high-order Boundary Element Method (BEM) is used to model all unsteady wave forcing. The time-domain BEM predicts first-order wave forces with zero mean value and second-order forces that are derived from first-order quantities. The second-order wave loads are computed in a postprocessing step after the solution to the first-order seakeeping problem, providing an efficient means of computing wave forces.The proposed hybrid simulation method is tested in two case studies: maneuvering of the Duisburg Test Case hull form and maneuvering of the KRISO Container Ship. The hybrid method is compared to high-fidelity CFD results computed using a two-phase solver with free-surface capturing by the Volume-of-Fluid method. The maneuvering trajectories computed with the hybrid method are found to compare favorably with the nonlinear results produced with the two-phase solver. Moreover, the hybrid simulation method shows (at minimum) a factor of ten reduction in computational cost for all cases tested herein, hence showing promise as an ecient option for simulation of ships maneuvering in waves.
590 $a School code: 0127.
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650 4 $a Naval engineering. $3 3173824
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