Overall Strength Analysis Of Vessel Based On The Fluid Structure Interaction Method

A ship is a floating building sailing on the surface of water, the water rapidly changing and the ship suffering from complex forces every moment, the winds, waves and flow influence on the ship, so the ship security is very important. Ship structure strength is one of the most important indexes of ship security, and it is a important task which studied by generations people. With the rapid develop of computer technology and software, the overall strength analysis of a ship become a reality.In order to estimate the ship structure strength accurately, to further improve the quality of the ship design, to find a more reasonable and rapider method for the ship strength calculation, a whole ship model was established, by using of fluid-structure method the overall strength of the ship was analyzed. By using of FLUENT the resistance of the ship and the circle flow filed of ship were calculated, and then the surface pressure of the ship in two kind of special condition, hogging and sagging were calculated. By using of the data transmission function of WORKBENCH, the surface pressure was exported to Static Structure, the overall strength, stress, strain and deformation were calculated.When the whole ship structure strength was analyzed, the water pressure on the ship hull(and other loads) need to be considered. The pressure become more complex when the ship sailing through waves, if we write a program to translate the result on the meshes and notes of the ship, it might cost great work. By using of One-way Fluid-Structure Interaction, the data can be translated intelligently without other program. On the premise of reasonable analyzing of fluid part, the pressure exported maybe more accurate.It is generally acknowledged, hogging and sagging are two dangerousest conditions, though this is an old topic, the research significance is beyond doubt. With the develop of the fluid dynamic and CFD software, it’s so easy to simulate the two condition by computer simulation. A user-defined function was wrote to simulate hogging and sagging, and the result offer valid data to Static Structure, which is used for calculating the overall strength of the ship.This paper also simulated the far field explosion around the ship, provide another set of reference data for overall strength of the ship.