Computation of Broadband Mixing Noise from Turbomachinery
Abstract
Time dependent CFD solutions are often contaminated by parasite waves. These waves consist of high frequency grid to grid oscillations. They are known to propagate with unusually high speed. The parasite waves are extremely undesirable creations of finite difference schemes. They degrade the quality of the solution. They introduce spurious nonlinear effects into the computed solutions. During the last six months we initiated and carried out a study of these waves. The scope of the study covers the generation of these waves and their propagation characteristics. Most important of all we have developed a way to selectively damp out these waves without affecting the main wave components. The effectiveness of the selective damping is demonstrated by a number of examples including wave solutions with discontinuities.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 29, 1992
- Accession Number
- ADA251605
Entities
People
- Christopher Tam
Organizations
- Florida State University