基于CFD与三因次法结合的低速多用途船的阻力预报

摘要

In order to achieve the resistance performance accurately forecast for low-speed multipurpose ship,numerical simulation based on CFD with three dimensional conversion model method is used to calculate the total resistance.3D model of a low speed multi-purpose ship is built based on the solidworks.GAMBIT software is used to watershed division and meshing division.CFD theory is used to Numerical simulation calculation.The total resistance coefficient under the corresponding speed is obtained.And according to Prohaska hypothesis and three-dimensional conversion model,the shape coefficient can be got through many times calculating.And then calculate the total resistance of the ship.The speed clouds are analyzed.Finally comparing with the traditional forecast resistance method to verify the method which was adopted in the paper has certain feasibility.Some references are given for the low speed multipurpose ship resistance study.%为了实现对低速多用途船舶的阻力性能进行准确预报,提出将基于CFD的数值模拟与三因次法相结合的总阻力预报方法,采用Solidworks三维软件对某低速多用途船进行三维建模,依据Gambit软件对模型进行流域划分和网格划分,应用CFD理论选取合理的湍流模型和求解方法进行数值模拟计算,得到对应航速下船模的总阻力值系数,根据普鲁哈斯卡假设和三因次方法,利用最小二乘法拟合形状系数,进而计算出实船的总阻力,并且分析数值模拟的速度云图.最后与传统阻力估算方法-艾亚法进行比较,说明本文采用的阻力计算方法是可行性,给今后低速多用途肥大型船的阻力研究提供借鉴.