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LES analysis of the influence of micro vortex generators geometry and position on the control of shock wave/ boundary layer interaction

Grébert, Arnaud and Jamme, Stéphane and Bodart, Julien and Joly, Laurent LES analysis of the influence of micro vortex generators geometry and position on the control of shock wave/ boundary layer interaction. (2019) In: 11th International Symposium on Turbulence and Shear Flow Phenomena (TSFP11), 30 July 2019 - 2 August 2019 (Southampton, United Kingdom).

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Official URL: http://tsfp11.org/openconf/modules/request.php?module=oc_program&action=summary.php&id=308


We investigate in this study how the height h and distance to the interaction d of microramp vortex generators (mVGs) placed upstream of a shock wave/boundary layer interaction (SBLI) may influence the efficiency of such passive devices in controlling the unsteady mechanisms and shock-induced separation suffered by this kind of flow configuration. To this end, high-fidelity Large Eddy Simulations (LES) are carried out on four different micro-vortex generators geometries in order to assess the effectiveness of low-profile microramp vortex generators (h < 0:4d) and medium size devices (0.5d < h < 0.8d) to alleviate the detrimental unsteadiness of SBLI, see Panaras & Lu (2015). All computations are performed at the same flow conditions as in the experiment of Wang et al. (2012) with a freestream Mach number of M = 2.7 and a Reynolds number of Req = 3600. The medium size microramps are found to generate the shedding of large scale structures in their wake triggering a high-frequency unsteadiness in the flow, two orders of magnitude higher than the low-frequency unsteadiness related to the reflected shock foot motion and leaving it unaffected in terms of frequency content. This family of medium size micro-vortex generators is however shown to significantly reduce the area of the separated region induced by the SBLI, as well as the pressure loads intensity on the wall surface. These improved performances come with very limited drag penalty. On the contrary, low-profile devices do display any significant change in the SBLI features.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:09 Sep 2019 09:45

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