Reynolds averaged simulation of unsteady separated flow
Reynolds averaged simulation of unsteady separated flow
复制标题
DOI：
10.1016/s0142-727x(02)00210-2
复制
发表时间：
2003-04-01
影响因子：
2.6
通讯作者：
Behnia, M
中科院分区：
文献类型：
--
作者：
Iaccarino, G;Ooi, A;Behnia, M
研究了Reynolds平均Navier-Stokes （RANS）湍流模型对复杂分离流动的预测精度。模拟了绕方形圆柱体和壁挂式立方体的非定常流场，并与实验数据进行了比较。对于立方体情况，以前发表的由稳态RANS获得的数值预测与实验数据都没有很好的匹配。然而，有证据表明，在这种流动中发生了相干涡脱落。它的存在需要非定常RANS计算，因为流动不是统计平稳的。本研究表明，非定常RANS确实可以预测周期性脱落，并且与现有实验数据的一致性比稳定计算得到的结果要好得多。(C) 2002爱思唯尔科学有限公司版权所有。
The accuracy of Reynolds averaged Navier-Stokes (RANS) turbulence models in predicting complex flows with separation is examined. The unsteady flow around square cylinder and over a wall-mounted cube are simulated and compared with experimental data. For the cube case, none of the previously published numerical predictions obtained by steady-state RANS produced a good match with experimental data. However, evidence exists that coherent vortex shedding occurs in this flow. Its presence demands unsteady RANS computation because the flow is not statistically stationary. The present study demonstrates that unsteady RANS does indeed predict periodic shedding, and leads to much better concurrence with available experimental data than has been achieved with steady computation. (C) 2002 Elsevier Science Inc. All rights reserved.