【摘要】：三維圓球繞流是流體力學(xué)中的經(jīng)典問(wèn)題,國(guó)內(nèi)外學(xué)者曾對(duì)此進(jìn)行過(guò)許多研究,但大多局限于較低雷諾數(shù)。該文采用基于動(dòng)力亞格子模型的大渦模擬對(duì)亞臨界雷諾數(shù)(Re=10~4)和超臨界雷諾數(shù)(Re=1.14×10~6)等高雷諾數(shù)下的圓球繞流進(jìn)行了數(shù)值仿真計(jì)算。計(jì)算結(jié)果表明,得到的阻力時(shí)均值和經(jīng)典Re-Cd曲線相吻合,相比于亞臨界雷諾數(shù),超臨界雷諾數(shù)下近球面回流區(qū)劇烈收縮,阻力系數(shù)銳減;圓球尾流場(chǎng)明顯偏離了中心軸(x軸),導(dǎo)致了側(cè)向力的存在;球后有大尺度的規(guī)則渦從圓球表面脫落。
[Abstract]:Three-dimensional spherical flow is a classical problem in hydrodynamics, which has been studied by many scholars at home and abroad, but mostly confined to lower Reynolds number. In this paper, the large eddy simulation based on dynamic sublattice model is used to simulate the flow around a sphere at high Reynolds numbers such as subcritical Reynolds number (Re=10~4) and supercritical Reynolds number (Re=1.14 脳 10 ~ 6). The calculated results show that the mean value of resistance time is consistent with the classical Re-Cd curve. Compared with the subcritical Reynolds number, the circumfluence region near the spherical surface shrinks sharply under the supercritical Reynolds number, and the drag coefficient decreases sharply. The wake field of the sphere deviates from the central axis (x axis), resulting in the existence of lateral force, and a large scale regular vortex shedding from the surface of the ball.
【作者單位】： 華中科技大學(xué)船舶與海洋工程學(xué)院;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃,2012AA091002)~~
【分類號(hào)】：O357.5

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