本文采用基于空间分解算法的分子动力学并行模拟方法，研究了微尺度、低雷诺数（Re=40）下串列等大的双圆柱绕流现象。结果表明：随着间距比L＊／D＊的增加，流动存在3种特征状态：当L＊／D＊〈1．1时，同单一物体的绕钝体流动相似；当1．1〈L＊／0＊〈3．5时，涡脱落现象只在下游圆柱出现，在两圆柱之间有交替附着于下游圆柱的双涡，且圆柱间涡的尺寸随间距比的增加而增大；当L＊／D＊〉3．5时，上下游圆柱后均产生涡脱落，但上游圆柱后涡的发展过程存在一定相位超前。上述流动特性与宏观尺度下的特性相同，但临界间距提前。此外，还得到了Strouhal数随间距比的变化规律。
Based on spatial decomposition algorithm, a parallel molecular dynamics simulation was carried out to investigate the behaviors of flow around two microscale circular cylinders in series. The results indicate that there are three basic flow patterns at different cylinder spacings. When L＊/D＊ 〈 1.1, the flow behavior is similar to the features of flow around a circular cylinder. When i.I 〈 L＊/D＊ 〈 3.5, the periodic shedding vortices are captured in the wake of downstream cylinder. Simultaneously, two vortices alternately adhere to the downstream cylinder, the size of which increases with the cylinder spacings. When L＊/D＊ 〉 3.5, the shedding vortices are observed in the wakes of two cylinders. The simulation results demonstrate that the critical cylinder spacing is smaller in microscale as compared with that in macroscale. Also, Strouhal numbers at different cylinder spacings were numerically investigated.
参考文献
| [1] | J. R. Meneghini;F. Saltara;C. L. R. siqueira;J. A. Ferrari Jr. .Numerical simulation of flow interference between two circular cylinders in tandem and side-by-side arrangements[J].Journal of Fluids and Structures,2001(2):327-350. |
| [2] | Delhommelle J.;Millie P. .Inadequacy of the Lorentz-Berthelot combining rules for accurate predictions of equilibrium properties by molecular simulation[J].Molecular physics,2001(8):619-625. |
| [3] | 刘松,符松.串列双圆柱绕流问题的数值模拟[J].计算力学学报,2000(03):260-266. |
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