Prediction of aeroacoustic flows

A large effort is performed regarding sustainable development, with the objective to reduce both  pollutant emissions (carbone dioxyde, NOx...) and noise. The second point is challenging for the design of new aircrafts since the European objective for 2020 is to decrease by 50% noise emissions related to air transport. This target requires the development of advanced tools to predict acoustic sources such as  aerodynamic noise (wings, landing wheels... ) and engine noise (fan, jet...).

During take-off, the jet noise induced by the engine is particularly important and difficult to predict. This phenomenon is studied in the Aerodynamics group of CERFACS, using adavanced numerical simulations. Innovative devices such as fluidic systems are then investigated in order to reduce the engine noise. This kind of technology acts on the propulsive jet by increasing mixing between the primary jet flow and micro-jet flows. However, physical mechanisms related to this control method are still not fully understood, requiring high-fidelity simulations.

Due to the strong impact of turbulence on studied phenomena, numerical simulations are based on the Large Eddy Simulation method (performed with the elsA software) to predict the near acoustic field. The Ffowcs Williams-Hawkings Analogy is then used for far field predictions. This work is performed in collaboration with CERFACS partners: Airbus, ONERA and CNRS laboratory from Poitiers (LEA) and supported in the frame of three projects: REBECCA  CRESCENDO and FLOCON.

Contacts:
Jean-Francois Boussuge, Arnaud Fosso-Pouangue, Hugues Deniau