Research On Hydrodynamic Performance And Heave‐pitch Coupled Motion Response Of Three‐dimensional Planing Ship

Lots of advanced designs of hull form appear as the demand for high-speed marinevehicles increases. The planning ship can produce dynamic lift force during theplanning process which can effectively reduce the wave making resistance and gethigher speed under the same power of main motor. The planning ship has remarkableadvantage in comparison with other hull forms. Hydrodynamic performance areclosely interconnected with the safety of planning ship. The change of components ofresistance force and the relative size of each item included in total is complex becauseof the planning ship is always in different movement state, so the research ofhydrodynamic characteristics is much more difficult than other regular displacementtype vessel, and there are still lots of problems unsolved.This research focuses on the application of numerical simulation method which isused to study the changes of hydrodynamic force of3D planning ship. Hydrodynamicperformance of3D planing ship was numerically simulated using computational fluiddynamics software FLUENT. Hydrodynamic characteristics of3D planing ship modelat two different attack angles and different Froude numbers were calculated. Resultswere compared with theoretical evaluation results and show good agreement. Thesurrounding flow field of planing ship during the motions was numerically simulated.By combining the simplified numerical model and computational control program, theheave-pitch coupled motion of planing ship was numerically simulated. Motionresponse of planing ship under different movement states was compared and analyzed.Curves of centre-of-gravity position and pitch angle were given in the paper andnumerical results were compared with results of planing ship moving with fixedattitude. Based on loxodromic towing test, computational models of different driftangles were established and numerical simulation was carried out using Fluent.Resistance performance of planing ship under different drift angles were comparedand analyzed. Curves about testing the hydrodynamic coefficients were presented.The study supplied a reference approach for hydrodynamic coefficient test whichcould get rid of the limit of experiment condition and had great significance in theresearch of hydrodynamic performance of planing ship.At present, research on hydrodynamic performance of planing ship still has manyunsolved problems which are always sloved by ship model test. Maneuvering test on planing ship is limited by experimental conditions because of the high speed ofplaning ship. Research in this field is not enough. So by the use of computationalfluid dynamics, motions of planing ship can be scientifically simulated andcalculated., Results are in accordance with the practice by combining air and waterin the study. The method used in this paper has great significance for further study ofhydrodynamic performance of planing ship. With the development of numericalsimulation technology, the numerical simulation method will be more and more usedin the research about motions of planing ship. This paper investigates applications ofnumerical simulation and software Fluent in the research of hydrodynamic force of3D planing ship which provides a reliable numerical model of the study of planingship.