RANS是工程中常用的CFD数值模拟模型,文中基于该模型对SUBOFF裸艇体的水动力特性开展数值模拟研究.传统SST(shear stress transport model)湍流模型采用了线性涡黏假设,难以描述复杂流场的各向异性流动现象.另外,传统SST模型对分离点的...RANS是工程中常用的CFD数值模拟模型,文中基于该模型对SUBOFF裸艇体的水动力特性开展数值模拟研究.传统SST(shear stress transport model)湍流模型采用了线性涡黏假设,难以描述复杂流场的各向异性流动现象.另外,传统SST模型对分离点的预测还可能出现延迟,使阻力预测值偏小.针对传统SST湍流模型的缺陷,提出使用各向异性的ASST(anisotropic shear stress transport)湍流模型及其再附修正来研究SUBOFF裸艇体的数值模拟计算问题,并对SST、SST(Reattach)、ASST及ASST(Reattach)4种湍流模型进行了比较研究.结果表明,相较于传统SST模型,ASST模型在预测SUBOFF裸艇的阻力上具有更高精确度,再附修正可有效克服阻力预测值偏小的问题,ASST(Reattach)模型在4种湍流模型中阻力预报性能最优.另外,针对不同站位的轴向及径向平均速度分布特性问题,4种湍流模型均能够取得与模型试验一致的数值模拟结果.展开更多
本文基于雷诺时均N-S方程(RANS),结合k-ε湍流模型及VOF(Volume of Fluid)方法,对在均匀流体及强分层流体中运动的suboff模型粘性流场及尾迹特征进行数值预报。首先,对均匀流体中suboff粘性流场进行数值试验,并通过网格无关性验证及sub...本文基于雷诺时均N-S方程(RANS),结合k-ε湍流模型及VOF(Volume of Fluid)方法,对在均匀流体及强分层流体中运动的suboff模型粘性流场及尾迹特征进行数值预报。首先,对均匀流体中suboff粘性流场进行数值试验,并通过网格无关性验证及suboff水动力性能、艇体压力分布等计算结果与试验结果的对比验证了本文数值方法的有效性与可靠性。其次,实现了强分层流体中运动suboff内波尾迹的数值预报。通过对比2种工况下suboff尾迹特征的空间分部及细节流场,分析了内波对suboff尾迹的影响方式。展开更多
Submarine maneuverability has been analyzed by means of computational fluid dynamics(CFD).This approach provides an alternative,accurate,and cost-effective method for simulating actual flow.The numerical results show ...Submarine maneuverability has been analyzed by means of computational fluid dynamics(CFD).This approach provides an alternative,accurate,and cost-effective method for simulating actual flow.The numerical results show that the numerical simulation of the viscous flow related to a moving submarine based on the RANS equation with a relevant turbulence model can not only provide rich flow field details such as flow separation,but also accurately predict its hydrodynamic performance.The present study indicates that CFD can be used to forecast the submarine’s maneuverability in the initial design stage.The present results will be used in the future as a basis for analyzing methods to reduce the vibration and noise generated by the submarine.展开更多
文摘本文基于雷诺时均N-S方程(RANS),结合k-ε湍流模型及VOF(Volume of Fluid)方法,对在均匀流体及强分层流体中运动的suboff模型粘性流场及尾迹特征进行数值预报。首先,对均匀流体中suboff粘性流场进行数值试验,并通过网格无关性验证及suboff水动力性能、艇体压力分布等计算结果与试验结果的对比验证了本文数值方法的有效性与可靠性。其次,实现了强分层流体中运动suboff内波尾迹的数值预报。通过对比2种工况下suboff尾迹特征的空间分部及细节流场,分析了内波对suboff尾迹的影响方式。
基金supported by Scientific Research Fund of Ministry of Education Innovation platform open fund Project(No.2018C01044)and(No.2018A03025).
文摘Submarine maneuverability has been analyzed by means of computational fluid dynamics(CFD).This approach provides an alternative,accurate,and cost-effective method for simulating actual flow.The numerical results show that the numerical simulation of the viscous flow related to a moving submarine based on the RANS equation with a relevant turbulence model can not only provide rich flow field details such as flow separation,but also accurately predict its hydrodynamic performance.The present study indicates that CFD can be used to forecast the submarine’s maneuverability in the initial design stage.The present results will be used in the future as a basis for analyzing methods to reduce the vibration and noise generated by the submarine.
