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A Practical Computational Method for...

Huang, Fuxin.

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A Practical Computational Method for Steady Flow about a Ship.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Practical Computational Method for Steady Flow about a Ship./
作者:	Huang, Fuxin.
面頁冊數:	169 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.
Contained By:	Dissertation Abstracts International74-10B(E).
標題:	Naval engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3564268
ISBN:	9781303130267

A Practical Computational Method for Steady Flow about a Ship.
Huang, Fuxin.

A Practical Computational Method for Steady Flow about a Ship. - 169 p.

Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.

Thesis (Ph.D.)--George Mason University, 2013.

A practical and robust method for evaluating the flow about a ship that steadily advances in calm water is developed. This method is validated via comparisons with experimental measurements for a broad range of ships and ship speeds. The important features of the flow around the hull of the ship --- notably the drag, sinkage and the trim experienced by the ship, the wave profile along the ship hull, and the pressure distribution at the hull --- are evaluated in the method, and compared with experimental measurements for validation purposes. The method is found to yield robust predictions, for a number of ship hulls, and these predictions are realistic and in relatively good agreement with experimental measurements overall. The simplicity, robustness and efficiency of the method makes it very well suited for routine applications to ship design, notably at early stages, and hull-form optimization for reduced drag.

ISBN: 9781303130267Subjects--Topical Terms:

3173824
Naval engineering.

A Practical Computational Method for Steady Flow about a Ship.
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245 1 2 $a A Practical Computational Method for Steady Flow about a Ship.
300 $a 169 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.
500 $a Adviser: Chi Yang.
502 $a Thesis (Ph.D.)--George Mason University, 2013.
520 $a A practical and robust method for evaluating the flow about a ship that steadily advances in calm water is developed. This method is validated via comparisons with experimental measurements for a broad range of ships and ship speeds. The important features of the flow around the hull of the ship --- notably the drag, sinkage and the trim experienced by the ship, the wave profile along the ship hull, and the pressure distribution at the hull --- are evaluated in the method, and compared with experimental measurements for validation purposes. The method is found to yield robust predictions, for a number of ship hulls, and these predictions are realistic and in relatively good agreement with experimental measurements overall. The simplicity, robustness and efficiency of the method makes it very well suited for routine applications to ship design, notably at early stages, and hull-form optimization for reduced drag.
520 $a The method that is developed and applied in this dissertation is based on a new theory, called Neumann-Michell (NM) theory, which is a modification of a classical theory, called Neumann-Kelvin (NK) theory. Unlike the NK theory, the NM theory does not involve a line integral around the mean waterline of the ship hull surface.
520 $a The main task considered in the dissertation is the development, and validation, of a robust and practical method for the numerical implementation of the NM theory, which essentially requires solving an integro-differential equation that determines the flow (potential) at the ship hull surface. The solution procedure developed in the dissertation is based on four main elements: (i) An iterative solution procedure, in which the initial approximation given by the Hogner approximation is improved iteratively. (ii) This iterative solution procedure is implemented within the framework of a practical low-order panel approach that assumes piecewise linear variations of the hull geometry, the flow potential, and the flow velocity within the flat triangular panels that approximate the ship hull surface. (iii) Physically unrealistic or inconsequential short gravity waves are removed, using parabolic extrapolation within a thin layer in the vicinity of the free surface with physics-based relations for the variation of the related extrapolation height. (iv) Numerical smoothing of the flow velocity, determined in the NM theory as the derivatives of the flow potential along two orthogonal unit vectors tangent to the hull surface, is also used. Filtering of short waves and numerical smoothing of the flow velocity are found to be critical elements of the solution procedure, and a main aspect of the work performed in the dissertation.
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710 2 $a George Mason University. $b Computational Sciences and Informatics. $3 3169362
773 0 $t Dissertation Abstracts International $g 74-10B(E).
790 $a 0883
791 $a Ph.D.
792 $a 2013
793 $a English
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