Numerical simulation and comparison with experiment for selfexcited oscillations in a diffuser flow
Abstract
This paper describes numerical simulations of selfexcited oscillations in a twodimensional transonic diffuser flow obtained by solving the NavierStokes equations with a twoequation turbulence model. Comparisons were made between the computational results and experimental data. For the mean flowfields, the agreement between computation and experiment is good for the wall pressures, shock location, and the separation and reattachment points. However, the thickness of the computed recirculation zone is about 50 percent of the measured thickness. For the fluctuating flowfields, a great deal of qualitative similarity exists between the computation and experiment; however, the predicted oscillation frequency is about 50 percent higher than the measured value. The formation of a succession of downstreamtraveling counterrotating vortices, as seen experimentally, is also vividly displayed in the numerical results.
 Publication:

AIAA, SAE, ASME, and ASEE, 21st Joint Propulsion Conference
 Pub Date:
 July 1985
 Bibcode:
 1985jpmc.confR....H
 Keywords:

 Computational Fluid Dynamics;
 Diffusers;
 Oscillating Flow;
 Self Oscillation;
 Computerized Simulation;
 Flow Velocity;
 NavierStokes Equation;
 Pressure Oscillations;
 Recirculative Fluid Flow;
 Transonic Flow;
 Turbulence Models;
 Two Dimensional Flow;
 Fluid Mechanics and Heat Transfer