Analysis Of Ship’s Wave-added Resistance With OpenFOAM

The international shipping industry is in the downward trend,resulting in the global shipbuilding industry new ship orders declining year by year,making many shipbuilding enterprises difficult.In order to improve market competitiveness,how to develop new ship types efficiently and economically is a common concern of the shipping industry.In the process of developing new ship types,it is very important to study the resistance performance of ships sailing under waves.With the rapid rise of computer technology,CFD(Computational Fluid Dynamics)method has gradually become the mainstream trend in the study of ship hydrodynamic performance with its advantages of high efficiency,convenience and economy.Among many CFD software,OpenFOAM,a free open source platform,is favored by many research institutes and scholars because of its abundant field computation library,powerful scalability and efficient parallel computing form.In the field of ship architecture,scholars at home and abroad based on OpenFOAM platform have carried out research in the fields of calculating ship hydrostatic resistance,building numerical tanks,analyzing ship motion response,and studying wave loads.However,due to the late start of the research,there has been a lack of systematic and effective methods for calculating the hydrodynamic performance of ships under wave loads.Therefore,based on the open source CFD platform OpenFOAM,this paper studies and concludes a systematic and effective numerical method for calculating the wave-added resistance coefficient of ships.The specific contents are as follows:(1)Based on OpenFOAM,Studying the method of building numerical tanks and comparing the Airy wave propagating numerical simulation results of Waves Foam and OpenFOAM’s wave-making boundary.Compares the numerical simulation results of the two modules with the theoretical results,and analyses the advantages and disadvantages of them.It is founded that the OpenFOAM’s wave-making boundary has better effect and stability in numerical wave-making.The numerical simulation verification of wave-current coupling is added to this module.(2)Referring to the experiment report of Delft University of Technology and taking Wigley ship type as the research object,this paper explores the method of calculating ship wave-addedresistance in OpenFOAM.The process of meshing,setting solution conditions and processing calculation results in OpenFOAM is introduced in detail.At the same time,it is validated in commercial software STAR-CCM+.Comparing the calculated results of the two methods with the experimental data,the reasons for the differentias are analyzed.KVLCC2 is selected as a further ship verification to explore whether the OpenFOAM calculation process summarized is also applicable to ship with more complex curved surface,and the settlement results are compared with the experimental data of Norwegian University of Science and Technology.In this paper,a feasible method for calculating ship wave-added resistance is concludede in OpenFOAM platform,and the method is verified by different ship types.It provides a reference case for the researchers who study the hydrodynamic performance of ships based on OpenFOAM...