考虑航行姿态的船模阻力及流场数值预报  

Resistance and flow field prediction of ship model with consideration of voyage attitude

作　　者：易文彬[1] 王永生[1] 彭云龙[1] 刘承江[1] YI Wen-bin WANG Yong-sheng PENG Yun-long LIU Cheng-jiang(College of Power Engineering, Naval Univ. of Engineering, Wuhan 430033, Chin)

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《海军工程大学学报》2016年第5期26-30,56,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51209212)

摘　　要：为精确得到船模阻力及流场,研究了网格划分、湍流模型及船模姿态对预报结果的影响。首先,采用切割体网格技术及棱柱层网格技术划分了多套网格,研究网格尺寸大小及棱柱层参数对阻力、兴波及伴流场的影响;然后,比较了三种不同湍流模型在船模阻力及伴流场预报中的差异;最后,基于合理的网格划分及湍流模型,采用DFBI的方法预报了船模在不同航速下的姿态及阻力。计算结果表明:当Fr>0.25时,不考虑航行姿态时阻力计算误差可达到18.3%。考虑航行姿态变化后,阻力计算误差小于3%;升沉和纵倾的计算值和试验值吻合较好。由此证明:采用DFBI方法考虑船体航行姿态的变化避免了网格变形或者重构,具有较好的收敛性和计算精度。To predict ship model′s resistance and flow field,the influence of meshing tragedy,turbulence models and attitude is studied.Trimmed mesher and prism layer mesher are adopted to generate different grids to study the influence of grid size and prism layer parameter on the prediction of resistance,wave making and wake field.Three different turbulence models are also compared in predicting resistance and wake field.DFBI method is adopted in predicting ship model attitude and resistance.Calcuiation results show that when Fr〉0.25,the error between model test and resistance calculation without considering attitude is 18.3%;With consideration of attitude,the resistance error is less than3% with sinkage and trim being predicted well.Thus,by DFBI method,the mesh distortion or remeshing could be avoided with good convergence and computation precision when the ship model′s attitude is taken into account.

关 键 词：CFD 阻力 湍流模型 升沉 纵倾 

分 类 号：U661.3[交通运输工程—船舶及航道工程]