The Structure of APG Turbulent Boundary Layers
The characteristics of three-dimensional intense uv-structures (Qs) in a strongly decelerated large-velocity-defect boundary layer are analyzed. The Q2 and Q4 structures are found to be different from those of turbulent channel flows studied by Lozano-Durán et al. (J Fluid Mech 694:100–130, 2012). They are less streamwise elongated, less present near the wall and wall-detached structures are more numerous. Moreover, contrary to channel flows, wall-detached Q2, and Q4 structures contribute significantly to the Reynolds shear stress.
KeywordsChannel Flow Direct Numerical Simulation Turbulent Boundary Layer Reynolds Shear Stress Adverse Pressure Gradient
Funded in part by the Multiflow program of the European Research Council. YM was supported in part by NSERC of Canada. We are grateful to A. Lozano-Durán for providing the data processing programs for the analysis of the Q structures.
- 2.A.G. Gungor, Y. Maciel, M.P. Simens, J. Soria, Analysis of a turbulent boundary layer subjected to a strong adverse pressure gradient. J. Phys.: Conf. Ser. 506, 012007 (2014)Google Scholar
- 6.A. Lozano-Durán, J. Jiménez, Time-resolved evolution of the wall-bounded vorticity cascade. J. Phys.: Conf. Ser. 318, 062016 (2011)Google Scholar
- 9.Y. Nagano, M. Tagawa, T. Tsuji, in Turbulent Shear Flows 8, ed. by F. Durst, R. Friedrich, B. Launder, F. Schmidt, U. Schumann, J. Whitelaw (Springer, Berlin, 1993), pp. 7–21Google Scholar