Flowfield and Acoustic radiation from imperfectly expanded supersonic jets: Computational Studies

This project involves the study of sound generated by supersonic jets like those emanating from the exhausts of high-performance military aircraft. This is a joint experimental/computational project with the University of Cincinnati. The flowfield and near-field noise from both convergent and convergent-divergent nozzles have been simulated. The emphasis is on imperfectly expanded or off-design conditions. The impact of grid resolution, initial and boundary conditions on the computed solutions have been assessed. Comparisons with analytical predictions on shock-cell spacing show very good agreement. Comparison to the experimental observations are underway and will be presented at the meeting.