Numerical aero- and hydro-acoustics, noise analyzations and noise control of technical flow systems.
Description
Numerical Aero- and Hydro-Acoustics
Calculation of noise emission and noise propagation around and within fluid flow systems:
Calculation of noise emission and noise propagation around and within fluid flow systems:
- CFD and acoustical calculations combined in the research code SPARC (Magagnato 1999)
- For open flow situations and far field evaluation: Acoustical Analogy according to Ffowcs- Williams und Hawkings (1996), integral ansatz, evaluation of sound pressure spectra at discretized observer points
- For semi-open/closed flow situations: Perturbation equations (e.g. Linearized Euler Eq.), field ansatz, evaluation of spacial wave propagation
- CFD-Calculation (Large Eddy Simulation) provides acoustical source information of fluid flow
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Acoustical Analogy: Large Eddy Simulation of Kármán Vortex Street |
Acoustical Analogy: Frequency spectrum (narrow band) of Kármán Vortex Street (drag tone) |
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| Perturbation equations: Propagation of pressure pulse in a cube surrounded by walls |