Computational Analysis of Tetrahedral Vortex Generator Effect on the Attenuation of Shock Induced Separation
Zare Shahneh A

Abstract
The results of a computational investigation into the effects of tetrahedral sub-boundary layer vortex generator on plummeting normal shock-induced turbulent boundary layer separation are presented. The experimental work has been developed in a freestream Mach number and Reynolds number of M=1.45 and Re=15.9×106/m respectively. It is aimed to assess a broad band and insight observation of the phenomena by applying a rare using CFD code called STAR-CD. The control device is a pair of tetrahedral geometry vortex generator with the length of 30 mm in x direction and base sizes of 3mm in y and z directions. The device is installed at 17 times boundary layer distance upstream of shock location in the simulated transonic wind tunnel. The results are showing flow pattern in the flow field region in the form of boundary layer velocity profiles, static pressure distributions, Mach number development and surface total pressure (Preston pressure) distributions. The generally good agreement achieved in this work between the pre-assessed experimental and current CFD results opens the way for further utilization of CFD in the area of shock/boundary layer interaction with 3-D mean compressible flow field, particularly for complicated geometries and possibly the hypersonic regime as well. This will enable to reduce the experimental cost and difficulty involved in investigating such systems.

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