2026-05-02T03:31:06Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/00007173 2021-12-13T02:44:20Z 1608151108672 1608151108672:1608152048756 user-mmu

Study on Wave Breaking Phenomena of Full Hull Forms with and without Protruded Bows Aye Aye Mon The purpose of the present paper is to investigate the effect of protruded bows on the wave resistance of slowly moving full hull forms. For this purpose, a new concept of cargo ship which is called Ultra Large Block coefficient Ship (ULBS) Cb≥0.95 is used as the basic ship and its bow is modified by adding a bulbous bow. Since ULBS is a very blunt ship and is designed to sail at low-speed, it will have large wave-breaking in front of the bow. As it is stated that the protruded bows are effective in reducing steepness of bow waves and also contribute to the reduction of wave breaking resistance, in the present study, a bulbous bow is considered as an example of flow control devices and is attached to ULBS models in order to reduce the wave-breaking at the bow of ULBS. Then, the wave making resistance coefficient, integration of the square of free surface elevations, and the square of free surface disturbance function D(x,y)-values which are related to the wave-breaking phenomena are calculated using Rankine source method and Baba’s low speed theory respectively for ULBS models with protruded bows in full load and ballast conditions. The calculated results are compared with those of non-bulbous bow ULBS models. The wave making resistance coefficient results of ULBS models with bulb appear to reduce in the case of full load condition but increase in the case of ballast condition. The integration of square of free surface disturbance function and wave elevation values of ULBS models with bulb, increase for both full load and ballast conditions compared to those without bulb. 2019-12-07 http://hdl.handle.net/20.500.12678/0000007173 https://meral.edu.mm/records/7173