The Numerical Simulation Of The Transverse Hydrodynamic Forces Of A Planing Vessel At High Speed

Planing vessel with its hull characteristics are capable of Intelligence surveillance&reconnaissance (ISR), arm protection, mines sweeping, anti-submarine, precise attacks andother functions and could be served for national economy as yacht and traffic boat. So theresearches on planing vessels are also becoming more and more popular in the ship field.Based on FLUENT software, the predicting methods of the hydrodynamic performance of aplaning vessel are studied in this paper.Firstly, the water entry problem of a wedge is calculated by using FLUENT software,and the numerical results are compared with the theoretical values. Good agreements areachieved, which validates the numerical model and method for the water entry of a twodimensional body. Further more, the hydrodynamic lift forces of a planing vessel arecalculated in combination with two and a half dimensional theory，and then the feasibility ofthe method is validated.Secondly, a dynamic meshing method based on one degree of freedom is presented,which can simulate the wave splash and splitting around the bow well. This dynamic meshingmethod is significant when predicting the hydrodynamic performance of a planing vessel andthe numerical predicted results with this dynamic meshing method are compared withexperiment results. The results shows that compared with the common numerical method fora displacement ship, the dynamic meshing method can simulate the wave splash and dragperformance well. Besides, another method is also brought forward, which can predict themotion of a planing vessel of six degrees of freedom without knowing the running attitudebeforehand. Contrast to the former approaches, which need the running attitude calculated byeither a model test or an empirical formula beforehand, this new method is quite convenient topredict the hydrodynamic performance. The numerical results are also compared with theexperimental data. The comparison results show that the method has a higher precision.Thirdly, three methods are adopted to calculate the transverse hydrodynamic forcesincluding the common method for a displacement ship, the dynamic meshing method basedon one degree of freedom and the method for the motion of six degrees of freedom. Thenumerical results and experimental data are compared and analyzed in this paper. Theapplicability of these three methods is studied, when predicting the transverse hydrodynamic forces of a planing vessel. Moreover, the relationships among the speed, roll angle and thehydrodynamic performance of the planing vessel are studied.Finally, by using FLUENT software, the numerical wave tank is established in this paper.And the motion and forces of a planing vessel in the wave are predicted successfully.The paper aims to provide a technical basis for further study on the transverse stability ofa planing vessel.