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SST-DES在小分离流动数值模拟中的改进

DOI: 10.13700/j.bh.1001-5965.2013.0587, PP. 1245-1249

Keywords: 分离涡模拟,SST湍流模型,小分离流动,灰区,亚格子模式

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Abstract:

在基于剪切应力运输(SST,ShearStressTransport)分离涡模拟(DES,DetachedEddySimulation)应对小分离流动的数值模拟中,上游雷诺平均方法(RANS,ReynoldsAveragedNavierStokes)区域内较大的涡黏性通过对流扩散方程传递到下游大涡模拟方法(LES,LargeEddySimulation)区域,导致自由剪切层解析湍流解迟迟得不到发展,剪切层失稳延后,出现强烈的灰区效应。为此将SST-DES中体现LES求解的类亚格子模式重新构造成标准k方程亚格子模式,防止多变量在RANS和LES交界面处对湍流黏性系数的混合影响,最终得到了一种改进的SST-DES方法。采用该方法对AS239翼型小分离数值模拟并与DES和延迟分离涡模拟(DDES,DelayedDetachedEddySimulation)结果进行对比,可以看出该方法在壁面边界层保留了SST-DDES特性的同时,在尾迹区大大提高了LES的可解能力,显著降低了灰区的影响。

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