Numerical simulation and comparison with experiment for self-excited oscillations in a diffuser flowThis paper describes numerical simulations of self-excited oscillations in a two-dimensional transonic diffuser flow obtained by solving the Navier-Stokes equations with a two-equation 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 downstream-traveling counter-rotating vortices, as seen experimentally, is also vividly displayed in the numerical results.
Document ID
19850057648
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hsieh, T. (U.S. Navy, Naval Surface Weapons Center Silver Spring, MD, United States)
Bogar, T. J. (McDonnell Douglas Research Laboratories St. Louis, MO, United States)
Coakley, T. J. (NASA Ames Research Center Moffett Field, CA, United States)