雷诺平均Navier-Stokes方程
机械
湍流
自由流
计算流体力学
还原(数学)
体积分数
材料科学
体积热力学
流量(数学)
流体体积法
雷诺数
物理
热力学
数学
几何学
复合材料
作者
Xujian Lyu,Hui Tang,Jianhua Sun,Xiaoguang Wu,Xianwen Chen
出处
期刊:Brodogradnja
[Faculty of Mechanical Engineering and Naval Architecture, Univ. of Zagreb]
日期:2014-06-30
卷期号:65 (2): 23-32
被引量:11
摘要
Summary This paper presents a mixture-model based computational fluid dynamics (CFD) simulation on the two-phase microbubble flow over the hull of a SUBOFF model, aimed at assessing the roles of air-injection-to-freestream velocity ratio and air volume fraction in microbubble resistance reduction. The numerical framework consists of the Reynolds-average Navier-Stokes (RANS) equations and the standard k e − turbulence model with standard wall function treatment, which is validated, without microbubbles, by existing experimental data of the same SUBOFF model. The effect of velocity ratio is then investigated by comparing different types of the resistance reduction at various water speeds, and the effect of air volume fraction on the friction resistance reduction is also studied with various air injection velocities. This study confirms that both the velocity ratio and air volume fraction play important roles in the microbubble resistance reduction phenomenon.
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