Nonequilibrium behavior of the disturbed turbulent boundary layer over a d-type rough wall. II - Turbulence quantities
Abstract
The variation of turbulence structure and the relaxation process of turbulence quantities to the equilibrium state for the d-type rough wall boundary layer disturbed by a cylinder rod have been investigated experimentally. The rod was positioned at two distances of yc/delta0 = 0.14 (inner layer) and 0.92 (outer layer). From the results, each turbulence quantity of the present rough wall flow disturbed by the rod virtually recovered over a shorter distance for yc/delta0 = 0.14 than that for yc/delta0 = 0.92. For yc/delta0 = 0.92, the turbulent intensities of the three components and the Reynolds shear stress profiles most possibly reach the equilibrium state differed from that of the undisturbed flow at the farthest downstream station. The influence of the disturbance was found to appear as the enlargement of the v component turbulent intensity profile for both cases. The relaxation process to the equilibrium flow was examined by evaluating the streamwise variation of turbulent kinetic energy flux.
- Publication:
-
JSME Transactions
- Pub Date:
- January 1992
- Bibcode:
- 1992JSMET..58..111S
- Keywords:
-
- Nonequilibrium Flow;
- Turbulent Boundary Layer;
- Wall Flow;
- Cylindrical Bodies;
- Disturbances;
- Reynolds Stress;
- Rods;
- Shear Stress;
- Fluid Mechanics and Heat Transfer