Affiliated faculty

André V. G. Cavalieri

Flávio J. Silvestre

Peter Jordan (Research scientist, Université de Poitiers)

Anurag Agarwal (Lecturer, University of Cambridge)

Daniel Rodríguez (Post-doctoral fellow, Universidad Politécnica de Madrid)

Tim Colonius (Professor, California Institute of Technology)

Students

Kenzo Sasaki (Master student, ITA)

Petrônio Nogueira (Undergraduate, ITA)

Funding source: Science Without Borders program (CAPES/Brazil), project entitled "Reduced-order modelling of installed turbulent jets and their sound radiation".

Description

The noise emitted by aircraft during the take-off phase is dominated by the sound generated by the turbulent jets that exit the engines. Solutions for both flow fluctuations and radiated sound are nowadays possible using large eddy simulations, but these have high computational cost. Our work has focused on the development of simplified, reduced-order models for jet turbulence and sound radiation. This is accomplished by modeling the largest structures in jets as linear instability waves, or wavepackets, by a linearisation of the flow equations. This reduces considerably the computational cost, and allows a greater insight into the flow physics due to the simpler structure of the modeled wavepackets. Moreover, all the linear algebra formalism is available to push further the understanding of the problem; in particular, the adjoint stability problem can be used to devise controls with a view to stabilising the jet and reducing their radiated sound. These objectives are pursued in an effort combining theory, simulation and experiment.