Computational Aeroacoustics: An OverviewAn overview of recent advances in computational aeroacoustics (CAA) is presented. CAA algorithms must not be dispersive and dissipative. It should propagate waves supported by the Euler equations with the correct group velocities. Computation domains are inevitably finite in size. To avoid the reflection of acoustic and other outgoing waves at the boundaries of the computation domain, it is required that special boundary conditions be imposed at the boundary region. These boundary conditions either absorb all the outgoing waves without reflection or allow the waves to exit smoothly. High-order schemes, invariably, supports spurious short waves. These spurious waves tend to pollute the numerical solution. They must be selectively damped or filtered out. All these issues and relevant computation methods are briefly reviewed. Jet screech tones are known to have caused structural fatigue in military combat aircrafts. Numerical simulation of the jet screech phenomenon is presented as an example of a successful application of CAA.
Document ID
20030020401
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Tam, Christopher K. W. (Florida State Univ. Tallahassee, FL United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2003
Publication Information
Publication: Ageing Mechanisms and Control Symposium