Prediction of turbulent flow through a transition duct using a second-moment closure
Abstract
The near-wall, full Reynolds-stress closure of Launder and Shima is employed to calculate the three-dimensional turbulent flow through a circular-to-rectangular transition duct. The solutions are compared with the recent experimental data of Davis and Gessner. The comparisons reveal that the computed streamwise velocity and vorticity fields are in remarkable agreement with the measurements. Downstream of the transition region, however, the computed Reynolds stresses appear to decay at a much faster rate than observed in the measurements. These results point to the need for further refinement of Reynolds-stress models to correctly predict the relaxation of rapidly strained turbulence towards equilibrium.
- Publication:
-
AIAA Journal
- Pub Date:
- November 1994
- DOI:
- 10.2514/3.12277
- Bibcode:
- 1994AIAAJ..32.2194S
- Keywords:
-
- Air Ducts;
- Decay;
- Ducted Flow;
- Reynolds Stress;
- Three Dimensional Flow;
- Transition Flow;
- Transition Layers;
- Turbulence;
- Turbulence Models;
- Turbulent Flow;
- Vortices;
- Computational Fluid Dynamics;
- Decay Rates;
- Strain Measurement;
- Stress Relaxation;
- Velocity Distribution;
- Vorticity;
- Fluid Mechanics and Heat Transfer