Accession Number : ADA266261


Title :   Three-Dimensional Turbulent Boundary Layer


Descriptive Note : Final rept. 25 Jan 1991-24 Jul 1992


Corporate Author : STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Moin, Parviz


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266261.pdf


Report Date : 06 Jan 1993


Pagination or Media Count : 127


Abstract : The near wall mechanics of 3D turbulent boundary layers were studied using direct numerical simulation. A fully developed turbulent channel flow was suddenly subjected to a transverse pressure gradient. An explanation for the reduction in the Reynolds stresses, observed in experiments, was provided in terms of the dynamics of near-wall streamwise vortices in turbulent boundary layers was described. It was shown that the effect of three-dimensionality is to change the trajectory of fluid particles in the vicinity of these vortices, and how this change leads to reductions of turbulence stresses. The proposed mechanisms are consistent with numerous statistical data and correlations which are presented. Turbulence, Boundary layers, Simulation


Descriptors :   *STRESS ANALYSIS , *TURBULENT FLOW , *TURBULENT BOUNDARY LAYER , *CHANNEL FLOW , STRESSES , VELOCITY , PRESSURE GRADIENTS , VORTICES , THREE DIMENSIONAL , SHEAR STRESSES , BOUNDARY LAYER FLOW , FLUID MECHANICS , REYNOLDS NUMBER , TRAJECTORIES , WALLS , CORRELATION , BOUNDARIES , BOUNDARY LAYER , TURBULENCE , STATISTICAL DATA , MATHEMATICAL MODELS , SIMULATION


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE