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Simulation of Euler-equations of mot...

University of Michigan.

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Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels./
Author:	Khalid, Muhammad Saeed.
Description:	135 p.
Notes:	Adviser: Armin W. Troesch.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Engineering, Marine and Ocean. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253310

Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels.
Khalid, Muhammad Saeed.

Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels. - 135 p.

Adviser: Armin W. Troesch.

Thesis (Ph.D.)--University of Michigan, 2007.

This thesis presents the use of radial-basis functions for estimation of quasi-nonlinear radiation and diffraction pressures and their conversion between two and three dimensions; as a result significant savings in computation-time are realized.Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels.
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008 110517s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3253310
035 $a AAI3253310
040 $a UMI $c UMI
100 1 $a Khalid, Muhammad Saeed. $3 1263658
245 1 0 $a Simulation of Euler-equations of motion and blended-nonlinear hydrodynamics for multi-hulled vessels.
300 $a 135 p.
500 $a Adviser: Armin W. Troesch.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1223.
502 $a Thesis (Ph.D.)--University of Michigan, 2007.
520 $a This thesis presents the use of radial-basis functions for estimation of quasi-nonlinear radiation and diffraction pressures and their conversion between two and three dimensions; as a result significant savings in computation-time are realized.
520 $a The focus of the research is the evaluation of dynamic and static pressures acting on floating bodies. Specifically, these pressures result from large motions of a multi-hull ship in 6 dof. The components of the dynamic pressure are radiation, diffraction, and the Froude-Kriloff pressures. Evaluation of instantaneous radiation and diffraction problems is always computationally expensive. Previously, many seakeeping analyses do not solve for the diffraction pressures explicitly.
520 $a A blended scheme is presented here for the evaluation of total hydrodynamic pressure. The method employs quasi-nonlinear radiation and diffraction models, and body exact hydrostatic and Froude-Kriloff pressures. The quasi-nonlinear radiation and diffraction pressures are estimated without solving the boundary value problems recursively, instead using a radial-basis function. The method is equally applicable to regular and irregular seas, in frequency and time domains. Direct integration of these pressures results in nonlinear displacements, other kinematics and the structural loads in terms of dynamic shear forces, bending and torsion moments in 6 dof. The nodal pressures are in an appropriate format for use in commercial software such as MAESTRO or other FEM based design tools. Nonlinearities arise from Euler angles, large motions and the exact instantaneous intersection of the body and free surface. For the forward speed corrections, ∂/∂x, is calculated by converting the two-dimensional velocity potential into a three-dimensional mathematical function via radial-basis functions. To restore two-dimensional characteristics of the boundary value solution, a backward conversion to two-dimensions is performed.
520 $a Good agreement is found between the blended method and experimental data for radiation and wave loads on a steadily moving vessel. To demonstrate the usefulness of the method, capsize basins and parametric roll studies were conducted. It is demonstrated that resonating roll excitation occurs for the given parametric conditions.
590 $a School code: 0127.
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Hydrology. $3 545716
690 $a 0388
690 $a 0547
710 2 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0127
790 1 0 $a Troesch, Armin W., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253310