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首页> 外文期刊>International Journal of Heat and Fluid Flow >Enhanced delayed DES of shock wave/boundary layer interaction in a planar transonic nozzle
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Enhanced delayed DES of shock wave/boundary layer interaction in a planar transonic nozzle

机译:平面跨音速喷嘴中冲击波/边界层相互作用的增强延迟DES

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摘要

An enhanced delayed detached eddy simulation of a shock wave/boundary layer interaction in an over-expanded planar transonic nozzle has been carried out to predict the fundamental features of shock low-frequency unsteadiness. The modification of the sub-grid length-scale proposed in Shur et al. (2015) has been implemented to attenuate some well-known problems of detached eddy simulation: the modeled-stress depletion in the switch region between RANS and LES and the consequent delay of transition to turbulence at the onset of separation. The comparison of the computational results with the experimental data shows that the enhanced DDES leads to significant improvements in the estimation of some flow features with respect to a different DDES version, even though some discrepancies are still observable in the distribution of the mean wall pressure, and additional work is needed to further improve the transition from modeled to resolved turbulence.
机译:为了预测激波低频不稳定的基本特征,已经对过扩展的平面跨音速喷嘴中的激波/边界层相互作用进行了增强的延迟分离涡模拟。 Shur等人提出的子电网长度尺度的修改。 (2015)已​​被实施以减轻涡流模拟中的一些众所周知的问题:在RANS和LES之间的转换区域中的模型应力耗竭以及在分离开始时过渡到湍流的延迟。计算结果与实验数据的比较表明,相对于不同的DDES版本,增强的DDES导致对某些流量特征的估计有了显着改进,即使在平均壁压的分布上仍然可以观察到一些差异,并且需要进一步的工作来进一步改善从建模到解决湍流的过渡。

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