Low Speed Streaks Instability of Turbulent Boundary Layer Flows with Adverse Pressure Gradient
A Direct Numerical Simulation of turbulent flow subjected to an adverse pressure gradient (APG) was performed. As already noticed by many authors in such configurations, a second outer peak of turbulent kinetic energy is observed in the region of APG. In the present configuration, this peak is due to the production of intense vortices which are shown to be related to the instability of low speed streaks.
KeywordsTurbulent Kinetic Energy Direct Numerical Simulation Turbulent Boundary Layer Streamwise Velocity Adverse Pressure Gradient
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- 4.Marquillie, M., Laval, J.-P., Dolganov, R.: Direct numerical simulation of separated channel flows with a smooth profile. J. Turbulence 9(1), 1–23 (2008)Google Scholar
- 7.Shah, S.I., Stanislas, M., Laval, J.-P.: A Specific Behavior of Adverse Pressure Gradient Near Wall Flows. In: Stanislas, M., Jimenez, J., Marusic, I. (eds.) Progress in wall turbulence: understanding and modelling, April 21-23, 2010. ERCOFTAC, pp. 203–209. Springer, Heidelberg (2010)Google Scholar