Project Details
Projekt
FOR 508: Noise Generation in Turbulent Flows
Subject Area
Thermal Engineering/Process Engineering
Term
from 2003 to 2009
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 5470251
Within this French-German Research Unit, novel noise simulation concepts for turbulent flow are considered. Since the analysis of the acoustic field strongly depends on the quality of the resolution of the turbulent flow field, we use LES and DNS as a basis to predict noise generation and propagation. The aim of this research is to re-investigate, compare and improve aeroacoustic approaches to find proper ways into the LES/DNS age of noise calculations, to get insight into the basic noise generation mechanisms and to find novel noise reduction concepts. It aims furthermore at intensifying the link between the different disciplines of Computational Fluid Dynamics (CFD) and classical acoustics via the relatively new domain of Computational Aeroacoustics (CAA). Jet flows at different subsonic and supersonic flow regimes will be the common class of flow problems to investigate.The prediction and reduction of jet noise has been the beginning of aeroacoustics over 50 years ago by Sir James Lighthill and there is still an urgent need for noise reduction, e.g., in the field of growing commercial aviation. The simulation of noise generated by turbulent jets remains a very challenging problem for numerical methods. The fact that turbulent jets are widespread among different industrial applications reinforces the choice of jet flow at different regimes as basic problem for the research group.It is our objective to come up with more advanced acoustic prediction techniques, which are to be applied in a design-to-low-noise process and as such will stimulate new control strategies that can lead to a noise reduction in the field of jet noise by approximately 10 dB. The essential parts in this new development are more efficient numerical algorithms to compute the flow field and the acoustical field on arbitrary meshes, an enhanced description of the turbulent flow, an improved zonal concept for noise generation and propagation, a stable description of the acoustics in strongly sheared flows and better anechoic boundary conditions. The cooperation between the French and German groups will enlarge the spectrum of numerical and theoretical research. It will also lead to a mutual transfer of knowledge and simplify the necessary data validation for problems where experimental results are difficult to obtain.
DFG Programme
Research Units
International Connection
France
Projects
- Fluid-acoustic coupling and wave propagation (Applicant Munz, Claus-Dieter )
- Low-dimensional modelling of turbulent jet noise (Applicant Sesterhenn, Jörn Lothar )
- Mechanisms and Active Control of Jet-Induced Noise (Applicant Rist, Ulrich )
- Noise Prediction for a Turbulent Jet (Applicant Schröder, Wolfgang )
- Numerical simulation of jet mixing noise associated with engine exhausts (Applicant Thiele, Frank )
- Physically based sub-grid scale modelling for large-eddy simulation to enhance turbulence noise prediction (Applicant Oberlack, Martin )
- Shock-induced noise in supersonic jets (Applicant Sesterhenn, Jörn Lothar )
Spokesperson
Professor Dr. Claus-Dieter Munz
