Numerical Analysis of a Cargo Vessel Motion

A modern ship design procedure can be seen as an iterative process where requirements, regulations and rules including, amongst others, analysis of seakeeping and intact stability criteria issued by the International Maritime Organization and ship design solutions are compared in order to achieve an optimum solution. The combination of the ever-growing population together with high demand for goods and increasing oil prices have resulted in the design of merchant ships that are optimized for minimum resistance and maximum load capacity. Certainly, the prediction of ship motion can be done in many different ways. Testing several full scale ships would unquestionably give the best estimate, but would of course be too costly and practically impossible. Another way of analysing ship motion is by testing ship models in wave basins. Although a better option than testing full scale ships, it is oftentimes consuming and costly. A third option is the prediction of ship motion by computer simulation. Computer simulations are done with respect to simplified models. These models represent physical reality to a degree that depends on the simplifications and assumptions made. The aim of this paper is to determine via numerical methods with Ansys CFX the motion of a cargo vessel involving modeling the ship sea-keeping for 2 DOF. The paper shows how, by using advanced numerical simulation techniques, one may describe accurately the ship motion due to the marine environment conditions like waves and wind. This simulation is done in order to have the input data for further studies like the sloshing effects of liquid freight inside the hold of the cargo ship; the study to be is described inside some subsequent articles. As the sloshing effect takes place, the structure of the ship is loaded and in some points of the structure the stress may become critical. By using the motion curves calculated, all these intricate simulations may be successfully developed.

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  • English

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  • Accession Number: 01606530
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 7 2016 5:53PM