Stage M2 – Large Eddy Simulation of a rotor with an impedance patch on its blades

Key words: Aeroacoustics, HPC, Large Eddy Simulation, Impedance, TDIBC

Background
UAVs are taking a significant space in our daily life since they share with us more and more common places due to their wide range of applications. We can find them in the film industry, health assistance, and they are forecast to be used for commercial deliveries. This translates into an increase in noise that not only affects the daily life of the people, but becomes an environmental problem. That is the reason why different approaches have been proposed to mitigate the acoustic footprint of drones ranging from the test of materials, optimization of rotor geometries and the use of bioinspired rotor blades.

Program of internship
In order to predict accurately the noise of rotors with impedance patches, a state-of-the-art simulation method, namely high-order large eddy simulations (HO-LES) of the full 3D Navier-Stokes problem, will be used. This flow solver is an in-house HO-LES code solving the 3D compressible Navier-Stokes equations, named IC3, and developed at ISAE-SUPAERO. It is based on high-order spectral methods for the spatial discretization, which allow high order of convergence, up to 5th order. These methods are well adapted to propagate the turbulent structures inside the jet mixing layer, as well as the acoustic waves with a very low dissipation. This solver has been used recently on regional, national and European supercomputing facilities
on various subsonic and supersonic flows.