Towards the characterization of micro vortex generators effects on shock wave / turbulent boundary layer interaction using LES

摘要

We perform Large Eddy Simulations (LES) of the experimental configuration by Wang et al. (2012): a rake of microramp vortex generators (MVGs) were inserted upstream the SWTBLI. The configuration features MVGs protruding by 0.47 delta in a TBL at M = 2.7 and Re_theta = 3600. We first validate the flow solver and LES strategy on a baseline configuration without control and we retrieve the characteristic length scales and the low frequency motion (StL = 0.03) of the reflected shock foot. The configuration with MVGs exhibits successive regions alternating between either momentum deficit or momentum excess downstream the MVGs, with good agreement with the experiments. Classical wake recovery laws were retrieved as well as the frequency of St = 0.53 characteristic of the shedding of intermittent structures downstream the MVGs and we observe a significant 20% decrease of the separation bubble length.