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MESSIAEN

© Free Field Technologies

Methods for Efficient SimulationS of Aircraft Engine Noise

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Publications

  • Mode-Matching in Engine Ducts with Vortical Flows
  • Impedance Models in Time Domain including the Extended Helmholtz Resonator Model 

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The MESSIAEN project focuses on the development of the ACTRAN/DGM software product for the simulation of noise generated by turbomachines found in aircraft and, thereafter, on the design of devices effecting a reduction of that critical noise source. To enlarge the scope of the project while maintaining the focus on a unified set of methods and tools, MESSIAEN investigated three distinct problems:

  • aero-engines with an eye on the specific needs and challenges of the engine manufacturer (Rolls-Royce), the nacelle manufacturer (Aermacchi) and the aircraft manufacturer (Airbus) responsible for the integration of the nacelle-engine ensemble in the aircraft;
  • helicopter engines (Turbomeca);
  • air conditioning pack noise (LTS).


MESSIAEN tackles tonal (as opposed to broadband) sources of noise because the relevant theoretical models have reached a sufficient level of maturity to support industrial processes at the end of the MESSIAEN project. MESSIAEN focused on the solution of linearized Euler equations by a discontinuous Galerkin method (DGM) on unstructured grids. This method, modelling the near field of the source, is coupled with the Ffowcs-Williams and Hawkings integral method to predict the far-field acoustic pressure. Besides the development of the solver itself, the following topics have been addressed:

  • Use of parallel processing techniques for tackling real industrial challenges, i.e., three-dimensional configurations over a representative frequency range in a CPU time compatible with industrial constraints.
  • Non-reflecting boundary conditions were used to minimize the acoustic waves reflected when disturbances leave the computational domain.
  • Stability issues of the Linearized Euler equations in the presence of strong shear have been assessed.
  • Effective modelling techniques for including impedance boundary conditions (liners) in time-domain solution schemes were developed.
  • Techniques for extracting aero-acoustic source terms from CFD results were enhanced.

The work of MESSIAEN continues within the TURNEX project.

Project Coordinator

Partners

  • Turbomeca SA (FR)
  • Aermacchi SPA (IT)
  • Airbus Central Entity (FR)
  • Odegaard & Danneskiold-Samsoe A/S     (DK)
  • Universite Catholique de Louvain (BE)
  • Rolls-Royce (UK)
  • University of  Southampton  (UK)
  • Vibratek (FR)
  • Technische Universiteit Eindhoven (NL)
  • Liebherr Aerospace Toulouse SA (FR)

Project status

Start Date : 2003-12-01
End Date : 2007-02-28
Duration : 39 months
Project Status : Completed
Programme Type : 6th FWP (Sixth Framework Programme)