Three-dimensional turbulent boundary layer
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. 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.
- Publication:
-
Stanford Univ. Report
- Pub Date:
- January 1993
- Bibcode:
- 1993stan.rept.....M
- Keywords:
-
- Boundary Layer Flow;
- Channel Flow;
- Computational Fluid Dynamics;
- Reynolds Stress;
- Three Dimensional Boundary Layer;
- Turbulent Boundary Layer;
- Turbulent Flow;
- Mathematical Models;
- Pressure Gradients;
- Shear Stress;
- Statistical Correlation;
- Turbulence;
- Vortices;
- Fluid Mechanics and Heat Transfer