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Showing 2 results for Wave Making Resistance

S.h. Sadathosseini, S.m. Mousaviraad, M.s. Seif,
Volume 1, Issue 2 (3-2005)
Abstract

Nowadays, various numerical methods are developed to extend computational fluid dynamics in engineering applications. One of the most useful methods in free surface modeling is Boundary Element Method (BEM). BEM is used to model inviscid fluid flow such as flow around ships. BEM solutions employ surface mesh at all of the boundaries. In order to model the linear free surface, BEM can be modified to a simple form called Green Function Method (GFM). In this paper a developed code is applied GFM to several problems including flows around ships and the results are presented. To verify the accuracy and application of the code, it is applied to flows around an analytically body which is Wigley hull and results are in good agreement with available data. The wave-making properties are also investigated. Variations of the wave pattern versus the speed are studied, and a quantitative investigation of the forces is performed. In addition, the effects of linear solution are studied. Presented results and computer code can be used to optimize the hull forms for decreasing wave making resistance.


Mohammad Said Shamshiri, Mohammad Moonesun,
Volume 17, Issue 33 (5-2021)
Abstract

In commercial ships, wave making resistance is a part of total resistance which to reduce it, a bulbous bow is added to the ship bow. To investigate the effect of bulbous bow on total resistance, a container ship model is simulated with and without the bulbous bow at three Froude Numbers: 0.22, 0.26 and 0.30. Initially, numerical simulation validation has been done, which shows that the results are valid. According to the results, the bulbous bow increases frictional resistance by a maximum of 2%. In these three Froude Numbers, the pressure resistance decreases by 17.1, 31.6 and 25.9%, respectively. At three mentioned Froude Numbers, bulbous bow decreases total resistance by 1.8, 8.9 and 13.3% respectively. In addition, the bulbous bow reduced the height of the wave made on the hull and the free surface. Bulbous bow causes positive effects on the hydrodynamic behavior of the vessel, which increase with increasing Froude Number.


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