Effect of Submerged Vertical Structures on Ship Waves
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Effect of Submerged Vertical Structures on Ship Waves

Effect of Submerged Vertical Structures on Ship Waves


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About the Book

This dissertation, "Effect of Submerged Vertical Structures on Ship Waves" by 繆泉明, Quanming, Miao, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled EFFECT OF SUBMERGED VERTICAL STRUCTURES ON SHIP WAVES Submitted by Miao Quanming for the degree of Doctor of Philosophy at The University of Hong Kong in December 2001 The effect of submerged vertical structures, which are located on both sides of a fairway, on ship waves has been investigated numerically. The method used in the thesis is based on Dawson's method, which uses a simple source distribution over the body surface and the undisturbed free surface. The free surface condition is linearized in terms of a double-model solution. The radiation condition is dealt with by the use of a one-side, upstream, four-point finite difference operator for the free surface condition. A FORTRAN computer program has been developed which can be applied to different boundary conditions. The agreement of the wave resistance and wave profile along the body surface calculated by the program in water of infinite depth with experimental results shows the validity and reliability of the program. A direct boundary element method (DBEM) for steady ship waves is also proposed and developed. The free surface condition is linearized under the assumption of a small wave amplitude. The radiation condition is dealt with as that in Dawson's method. The advantage of this method is that some iterative methods such as the pre-conditioned GMRES can be used to solve the linear equation with the asymmetric density solution matrix at a moderately large ship velocity while Dawson's method fails to obtain convergent results by any iterative method. The results on the wave resistance and wave profile along the body surface show a good agreement with the experimental data. The results on different parameters of the submerged vertical walls (bottom-standing) show that the width and height of the walls can influence reflection and transmission of ship waves significantly. However, different distances between the walls have almost the same effect on the reflection and transmission characteristics and on ship waves in the region outside the walls. Ship waves affected by the submerged vertical walls at different ship velocities are also discussed. For a surface-piercing vertical barrier, the reflection and transmission characteristics are associated with the width and height of the barrier and it is very effective to reduce ship waves in the outside region when the height or the width of the barriers is not too small. Results of different geometrical size of a submerged arc-shaped or trapezoid-shaped vertical wall show that different sizes will give different influence on the wave propagation. The reflection and transmission performance is sensitive to the geometrical size of the wall. A ship moving in a channel with a concave-shaped bottom is also discussed in order to investigate the wave patterns. DOI: 10.5353/th_b3025176 Subjects: Underwater construction Water waves - Mathematical models


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Product Details
  • ISBN-13: 9781374727014
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 154
  • Weight: 372 gr
  • ISBN-10: 1374727016
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 8 mm
  • Width: 216 mm


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