Conveners
A07.00 Flow Acoustics: S040
- Stefan Becker (LSTM, FAU Erlangen-Nรผrnberg)
- Francesco Avallone (Politecnico di Torino)
- Stefan Schoder (IGTE, TU Graz)
- Roberto Camussi
A07.00 Flow Acoustics: S341
- Stefan Becker (LSTM, FAU Erlangen-Nรผrnberg)
- Roberto Camussi
- Stefan Schoder (IGTE, TU Graz)
- Francesco Avallone (Politecnico di Torino)
A07.00 Flow Acoustics: S344
- Stefan Schoder (IGTE, TU Graz)
- Stefan Becker (LSTM, FAU Erlangen-Nรผrnberg)
- Francesco Avallone (Politecnico di Torino)
- Roberto Camussi
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Ramesh Raja Subramanyam (German National Metrology Institute)10/09/2026, 08:40A07 Flow Acoustics
The development of an acoustic measurement platform using UAVs enables noise field mapping and sound source characterization of outdoor low-frequency noise sources that are, otherwise, difficult to be measured in laboratory environment due to dimensional constraints. A simplified analytical model using spherical harmonics and a multipole expansion of the Greenโs function has been developed for...
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Michael Buba (Technical University of Munich)10/09/2026, 09:00A07 Flow Acoustics
Galbrunโs equation, a displacement-based EulerianโLagrangian formulation for aeroacoustics, offers a promising framework for modeling and simulating fluid-structure interaction in flow. The numerical solution of Galbrunโs equation remains challenging. Standard finite element method approaches are prone to instabilities that give rise to spurious nonphysical modes, an effect that is further...
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Christophe Bogey (CNRS)10/09/2026, 09:20A07 Flow Acoustics
Ray tracing is performed from a point source located on the axis of a cylindrical shear layer at a Mach number ranging up to Mj=2. In all cases, some of the rays originally directed upstream are guided by the jet flow. These guided jet rays (GJR) can be entirely or partially confined inside the jet depending on the Mach number and the ray initial angle. They can travel in the upstream or...
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Johan Christian van Aswegen (German National Metrology Institute)10/09/2026, 09:40A07 Flow Acoustics
In the context of smart cities, large-scale acoustic sensor networks are vital for the evaluation and control of acoustic noise. The logistical challenge of ensuring calibrated acoustic sensor networks remains a hurdle. We present a portable acoustic source, that can be used for efficient in-situ calibration and failure detection of distributed acoustic sensor nodes. The sourceโs internal...
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Ajit Rokade (รcole Centrale de Lyon)10/09/2026, 10:00A07 Flow Acoustics
Two families of analytical models for wall-pressure fluctuation spectra in zero-pressure-gradient turbulent boundary layers are reexamined. On the one hand, the formulations by Lysak (Journal of Fluids Engineering 128, 216โ222, 2006) and Grasso et al. (Journal of Fluid Mechanics 877, 1007โ1062, 2019), among others, are developed in the wavenumberโfrequency domain. On the other hand, the...
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Stefan Becker (LSTM, FAU Erlangen-Nรผrnberg)10/09/2026, 10:40A07 Flow Acoustics
On-board microphones on drones enable external sound acquisition without the need for ground-based arrays; they can be positioned flexibly and quickly to suit individual requirements and allow for wide-area sound measurements. However, measurement performance is significantly influenced by high self-noise, as well as by flow conditions, microphone arrangement and wind protection. This paper...
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Luana Georgiana Stoica (Universita degli Studi Roma Tre)10/09/2026, 11:00A07 Flow Acoustics
The spreading use of small UAVs makes their noise emissions a compelling issue for their social acceptance and public health impact. In this context, understanding the mechanisms of noise generation and identifying effective strategies for noise mitigation could favour a sustainable integration of UAVs into populated environments. To this aim, a parametric experimental study was conducted on a...
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Ivor Santak (FSB, University of Zagreb)10/09/2026, 11:20A07 Flow Acoustics
Propellers are the dominant source of noise in drones,with the blade tip region playing a critical role due tohigh local flow velocities and strong aerodynamic interactions.In addition to overall sound pressure level,the spectral content of the emitted noise significantlyinfluences human perception and annoyance.This study investigates the effect of blade tip geometryon A-weighted sound...
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Florian Schwertfirm (KM Turbulenz GmbH)10/09/2026, 11:40A07 Flow Acoustics
In recent years, simulation methods for two-way coupled acousticfluidโstructure interaction (AFSI) have significantly advanced and areincreasingly applied to complex automotive configurations. Theseapproaches enable a detailed analysis of coupling mechanisms betweenflow, acoustics, and structural response, and allow identification ofdominant excitation pathways and their implications for...
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Geervan Ramasawmy (Institute for Aerodynamics & Flow Tech)10/09/2026, 14:20A07 Flow Acoustics
Aerodynamic source localization is conventionally performed by reconstructing acoustic source distributions from real or virtual microphone-array signals after propagation to the far field. Delfs and Ruck [1,2] proposed a diffraction-filtering methodology that reconstructs the acoustically active surface pressure and an associated surface source quantity directly from simulated surface...
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Oriol Guasch (La Salle, Universitat Ramon Llull)10/09/2026, 14:40A07 Flow Acoustics
In this work, we revisit a unified numerical framework for simulating subsonic aeroacoustic phenomena based on an isentropic formulation of the compressible NavierโStokes equations. The approach relies on a velocityโpressure setting in which the energy equation is omitted under isentropic assumptions, yielding a system that remains well conditioned in the low-Mach limit while reducing the...
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Claire Bourquard (Eindhoven University of Technology)10/09/2026, 15:00A07 Flow Acoustics
Flow induced noise in piping systems can lead to unacceptable acoustic emissions, vibration, and long term structural damage. Identifying the physical mechanisms and spatial regions responsible for sound generation remains challenging, particularly in turbulent flows where convective pressure fluctuations coexist with radiating acoustic waves. In this work, a rectangular T-junction with a...
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Stefan Jacob (German National Metrology Institute)10/09/2026, 15:20A07 Flow Acoustics
Winds and temperature inversions in the lower atmosphere can create waveguides for acoustic waves. These waveguides are similar to acoustic ducts, such that the sound field can be represented as a superposition of a finite set of propagating atmospheric modes. These modes are obtained by solving a cubic eigenvalue problem derived from the linearized Euler equations. This approach enables the...
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Jรถrg Riedel (LSTM Erlangen (Germany))10/09/2026, 15:40A07 Flow Acoustics
The fans in the cooling system contribute significantlyto the noise emissions of heavy construction equipmentsuch as rotary drilling rigs. Protective grilles are usedto prevent people and animals from coming into con-tact with the rapidly rotating fan blades. It is knownfrom the relevant literature that such protective grilleson axial fans can increase the fanโs radiated soundpower by several...
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Jacopo Grassi (University of Ferrara, Department of Engineering)10/09/2026, 16:00A07 Flow Acoustics
The present work proposes an integrated aero-psychoacoustic framework based on a reduced-order model (ROM) for the rapid prediction of rotor noise and its perception. This study focuses on an automotive axial fan installed downstream of a heat exchanger. While traditional design relies on conventional acoustic metrics (e.g., A-weighted SPL, OASPL), this methodology prioritizes human...
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