Prediction of Noise Radiated by a Non-Isothermal Mixing Layer Using a Low Mach Number Approximation
Abstract
The ability of an acoustic analogy to predict the sound radiated by a transitional mixing layer is evaluated by means of Direct Numerical Simulation results. The specific case of low Mach number flows with density variations is investigated. We consider the strategy where the acoustic source information is based on numerical results where the sound waves has been removed in order to limit the global computational cost of the prediction. It is shown that the low Mach number approximation coupled to- the acoustic analogy can lead to very accurate predictions for the radiated sound if the acoustic sources in Lighthill's equation are taken into account carefully. The scaling laws of the acoustic intensity deduced from a repeated use of the Lighthill's analogy on a wide range of Mach numbers suggest a new interpretation about the experimental observations on the sound emission from hot and cold jets.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2003
- Accession Number
- ADP014107
Entities
People
- F. Golanski
- V. Fortune
- Éric Lamballais
Organizations
- University of Poitiers