The main transport channel of the global economy is represented by shipping. Engineers and hull designers are more preoccupied in ensuring fleet safety, the proper operation of the ships, and, more recently, compliance with International Maritime Organization (IMO) regulatory incentives. Considerable efforts have been devoted to in-depth understanding of the hydrodynamics mechanism and prediction of ship behavior in waves. Prediction of seakeeping performances with a certain degree of accuracy is a demanding task for naval architects and researchers. In this paper, a fully numerical approach of the seakeeping performance of a KRISO (Korea Research Institute of Ships and Ocean Engineering, Daejeon, South Korea) container ship (KCS) container vessel is presented. Several hydrodynamic methods have been employed in order to obtain accurate results of ship hydrodynamic response in regular waves. First, an in-house code DYN (Dynamic Ship Analysis, “Dunarea de Jos” University of Galati, Romania), based on linear strip theory (ST) was used. Then, a 3D fully nonlinear time-domain Boundary Element Method (BEM) was implemented, using the commercial code SHIPFLOW (FLOWTECH International AB, Gothenburg, Sweden). Finally, the commercial software NUMECA (NUMECA International, Brussels, Belgium) was used in order to solve the incompressible unsteady Reynolds-averaged Navier–Stokes equation (RANSE) flow at ship motions in head waves. The results obtained using these methods are represented and discussed, in order to establish a methodology for estimating the ship response in regular waves with accurate results and the sensitivity of hydrodynamical models.
Abstract. The inland waterway cargo transport has extended over the decades, bringing up specific technical issues. From the hydrodynamics point of view, for the inland ships one of the most challenging issue is the effect of shallow water on the ship resistance. In the present study, there are developed numerical analyses for the viscous flow around a barge hull in the case of the shallow water fluid domain. The barge hull has prismatic shapes, in the cargo holds areas, with vertical sides, and geometric non-linear shapes more significant at the fore part. The hull shape CAD model is developed by Rhinoceros software. The numerical analyses are performed by CFD RANS-VOF method, with free surface and shallow-water, using the NUMECA / FineMarine software, having free sinkage and trim conditions. The shallow-water flow induces significant hydrodynamic non-linearities in compare to the deep-water flows. Several ship speeds and water depths are considered. We have focused on the identification of the ship's induced waves system and the resulting barge resistance. The conclusions of this study are stressing out the significant influence of the shallow-water conditions on the barge resistance, making possible to draw up practical technical information's for the barge hull design.
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