A Reynolds stress closure description of separation control with vortex generators in a plane asymmetric diffuser
A Reynolds stress closure description of separation control with vortex generators in a plane asymmetric diffuser
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DOI：
10.1063/1.2800877
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发表时间：
2007-11
影响因子：
4.6
通讯作者：
O. Törnblom;A. Johansson
中科院分区：
文献类型：
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作者：
O. Törnblom;A. Johansson
提出了一种模拟单一方向湍流中流向涡流效应的方法。雷诺平均纳维-斯托克斯方程用微分雷诺应力湍流模型求解。假设涡流可以用 Lamb-Oseen 模型来近似，则计算壁法向雷诺应力分布，对应于涡流发生器下游估计速度分布的翼展方向方差。由于涡流发生器而产生的雷诺应力贡献被添加到来自湍流模型的雷诺应力，以便模拟由于涡流发生器而增加的混合。体积力也应用于平均动量方程，以解释涡流发生器的阻力。该模型经过测试，并与不使用涡流发生器分离的平面非对称扩散流的实验数据进行了比较。结果表明该模型能够模拟涡流发生器的主要特征...
A way to model the effects of streamwise vortices in a turbulent flow with one homogeneous direction is presented. The Reynolds averaged Navier-Stokes equations are solved with a differential Reynolds stress turbulence model. Assuming that the vortices can be approximated with the Lamb-Oseen model, wall-normal Reynolds stress distributions are calculated, corresponding to the spanwise variances of the estimated velocity distribution downstream of the vortex generators. The Reynolds stress contributions that are due to the vortex generators are added to the Reynolds stresses from the turbulence model so as to mimic the increased mixing due to the vortex generators. Volume forces are applied also in the mean momentum equations to account for the drag of the vortex generators. The model is tested and compared with experimental data from a plane asymmetric diffuser flow which is separating without vortex generators. The results indicate that the model is able to mimic the major features of vortex generator fl...