We are delighted to offer you this presentation, held by Christopher Teruna from TU Delft at the 5th Wind & Drivetrain Conference on April 6, 2022.

​​​​​​​Christopher Teruna has recently obtained his doctorate in aeroacoustics from the Delft University of Technology. While pursuing his Ph.D., he has conducted numerous computational studies using the Lattice-Boltzmann solver, Dassault Systèmes SIMULIA PowerFLOW. 
Christopher's research focused on applying permeable materials to reduce turbulence-induced noise, which affects many aerodynamic systems from aircraft engines to wind turbines.

Abstract:

This presentation demonstrates the usage of a Lattice-Boltzmann solver to study the noise mitigation mechanisms in the application of a permeable trailing edge. The study employs a NACA 0018 airfoil installed at zero angle-of-attack. The permeable trailing edge has been modeled in the simulation as an equivalent fluid region where Darcy's law applies. Due to the limitation of Darcy's law in regions with small thicknesses, an alternative multi-layer modeling approach has been proposed and validated. Subsequently, this approach examines the behaviors of turbulent pressure fluctuations nearby and inside the permeable trailing edge. 
It is found that the interaction between pressure fluctuations on both sides of the trailing edge weakens the impedance discontinuity at the trailing edge, which is eventually responsible for the noise reduction.

Please see below for the presentation slides​​​​​​​ of Christopher's presentation:

PDF:

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