Eighth International Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP8
SCALING AND CORRELATION OF FLUCTUATING VORTICITY IN TURBULENT WALL LAYERS
pages 1-6
DOI: 10.1615/TSFP8.640
RÉSUMÉ
Asymptotic expansions for the profiles of fluctuating vorticity in boundary layers are proposed based on DNS data. The inner region requires two terms with different scalings; < ωiωi > /(U0uτ3 / v2 ) and <ωiωi> /(u4τ / v2 ). The first term decays exponentially and needs no matching term in the outer region. The second term has an overlap behavior of ~ C / y+. To match the outer region this requires a third scaling for the outer expansion <ωiωi> /(u3τ / vδ) . This scaling turns out to be the Kolmogorov time scale.