Results 51 to 60 of about 4,706 (230)

Continuous Adjoint to Proudman's Formula for Aeroacoustic Shape Optimization

International Journal for Numerical Methods in Fluids, Volume 97, Issue 6, Page 966-984, June 2025.
This paper presents a cost‐efficient framework for aeroacoustic shape optimization by developing the adjoint to Proudman's formula, coupled with the steady‐state RANS equations and the k‐ ω$$ \omega $$ SST turbulence model. The aeroacoustic model and the adjoint solver are initially validated/verified with experimental data/finite differences, before ...
M. Erfan Farhikhteh, E. M. Papoutsis Kiachagias, K. C. Giannakoglou   +2 more
wiley   +1 more source

Tonal-Noise Assessment of Quadrotor-Type UAV Using Source-Mode Expansions

Acoustics, 2020
The present work deals with the modeling of the aerodynamic sound generated by the propellers of small-size drones, taking into account the effects of horizontal forward flight with negative pitch and of installation on supporting struts.
Michel Roger, Stéphane Moreau
doaj   +1 more source

Development and validity of type II sulcus vocalis in excised canine larynx

World Journal of Otorhinolaryngology - Head and Neck Surgery, Volume 11, Issue 2, Page 276-280, June 2025.
Abstract Objectives This study aims to develop a sulcus vocalis model in the excised canine larynx and to investigate the validity of the model. Methods Type II sulcus vocalis was created by continuous intradermal suture in six excised canine larynges.
Ting Gong, Peng‐Cheng Yu, Chao Xue, An‐Rong Sun, Yi Zhang, Rui Fang, Bing‐Hua Zhu   +6 more
wiley   +1 more source

Leading-Edge Noise Mitigation on a Rod–Airfoil Configuration Using Regular and Irregular Leading-Edge Serrations

Applied Sciences
Rod–airfoil configurations are commonly used to study turbulence–structure interaction noise, which is a major contributor to aerodynamic noise in various engineering applications.
Mehmet Numan Kaya, Sutharsan Satcunanathan, Matthias Meinke, Wolfgang Schröder   +3 more
doaj   +1 more source

Spatiotemporal optical vortex reconnections of loop vortices

Nanophotonics, Volume 14, Issue 6, Page 729-739, April 2025.
Abstract Reconnections of spatiotemporal optical vortices have been shown to occur between line vortices. Here, we show that reconnections also occur between spatiotemporal loop vortices in optical waves. As optical loop vortices propagate in a media with spatial diffraction and material group velocity dispersion, unique reconnections occur.
Jordan Adams, Andy Chong
wiley   +1 more source

Experimental Investigation of Rotor Noise in Reverse Non-Axial Inflow

Aerospace
This paper experimentally characterises the far-field noise emissions of a rotor operating in reverse non-axial inflow conditions. Specifically, experiments were undertaken at a range of rotor tilting angles and inflow velocities to investigate the ...
Liam Hanson, Leone Trascinelli, Bin Zang, Mahdi Azarpeyvand   +3 more
doaj   +1 more source

An Experimental Study of the Unsteady Aerodynamics of a Static DU91‐W2‐150 Airfoil at Large Angles of Attack

Wind Energy, Volume 28, Issue 3, March 2025.
ABSTRACT The airfoil DU91‐W2‐150 was investigated in the Low Speed Low Turbulence Tunnel at the Delft University of Technology to study unsteady aerodynamics. This experimental study tested the airfoil under a wide range of angles of attack (AoA) from 0° to 310° at three Reynolds numbers (Re$$ \mathit{\operatorname{Re}} $$) from 2×105$$ 2\times 1{0}^5 $
Guanqun Xu, Wei Yu, Andrea Sciacchitano, Carlos Simao Ferreira   +3 more
wiley   +1 more source

Influence of Gurney Flap and Leading-Edge/Trailing-Edge Flaps on the Stall Characteristics and Aeroacoustic Performance of Airfoils

Fluids
In aerospace, flow control techniques have improved the separation flow characteristics around airfoils by various means. In this paper, the delayed detached eddy simulation (DDES) technique is used to simulate the detailed flow field around the NACA0021
Zelin Liu, Kaidi Li, Xiaojing Sun
doaj   +1 more source

Sound Synthesis of Objects Swinging through Air Using Physical Models

Applied Sciences, 2017
A real-time physically-derived sound synthesis model is presented that replicates the sounds generated as an object swings through the air. Equations obtained from fluid dynamics are used to determine the sounds generated while exposing practical ...
Rod Selfridge, David Moffat, Joshua D. Reiss   +2 more
doaj   +1 more source

Full‐Waveform Simulation of Infrasound Propagation in the Atmosphere: A Case Study of the 2023 April 20 SpaceX Starship Explosion

Advances in Astronomy, Volume 2025, Issue 1, 2025.
Infrasound, low‐frequency sound below 20 Hz, has been a key technology to monitor explosion events in the atmosphere. The International Monitoring System (IMS) of the Comprehensive Nuclear‐Test‐Ban Treaty Organization provides the means for continuous monitoring of infrasonic events worldwide.
Keehoon Kim, Elizabeth A. Silber
wiley   +1 more source