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Deutsches Zentrum f. Luft- und Raumfahrt e.V. (DLR)

Deutsches Zentrum f. Luft- und Raumfahrt e.V. (DLR)

Compressible boundary layers over acoustically resonant porous surfaces

  • REFERENT: Carlo Scalo (Assistant Professor), Mechanical Engineering, Purdue University (USA), (Eingeladen von Alexander Wagner, AS-RFZ, Gö)
  • TITEL: Compressible boundary layers over acoustically resonant porous surfaces
  • ZEIT: Donnerstag, 11.08.2016, 13:30 Uhr Vortragsbeginn
  • ORT: DLR Göttingen, Adolf-Busemann-Raum (Hörsaal Haus 7, EG)

The talk will discuss fundamental computational and physical aspects associated with transitional and turbulent boundary layer control via acoustic resonance and absorption in porous walls. The dynamics of waves propagating in porous cavities will be analysed via direct and inverse eigenvalue approaches with focus on the characterization of the surface impedance. The latter is defined as the ratio between the Fourier transforms of pressure and transpiration velocities at the interface. High-fidelity numerical simulations retaining full aeroacoustic coupling between the overlying flow and porous walls relying on the time-domain technique by Scalo et al., Phys. Fluids (2015) will be discussed. Finally, plans to perform direct numerical simulations of the experiments by Wagner et al., AIAA 2012-5865 in hypersonic flow control over ultrasonically absorptive porous coatings will be presented in the context of a recently awarded research grant.
Carlo Scalo is an Assistant Professor in the School of Mechanical Engineering at Purdue University. He completed his Post-Doc at Stanford University (2014), working on theoretical and numerical modeling of thermoacoustic instability and sound-turbulence interactions in compressible boundary layers. He completed his Ph.D. (2012) at Queen's University, Canada on large-eddy simulations of high-Schmidt-number turbulent mass transfer in equilibrium and non-equilibrium geophysical flows. He obtained his B. Eng. (2006) and M.Sc. (2008) in Aerospace Engineering at the Università degli Studi di Napoli - Federico II, Italy.
Carlo Scalo combines high-fidelity simulations with analytical modeling. His research interests include geophysical flows, turbulent heat-and-mass transfer, thermo- and nonlinear acoustics, low- and high-speed turbulence.

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