Results 51 to 60 of about 304 (177)

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

Assessment of Turbulence Models for Cylinder Flow Aeroacoustics

Aerospace
Numerical simulations are performed for flows over a circular cylinder at a Reynolds number ranging from 150 to 5000, and Mach number of 0.2, to assess the predictive capability of URANS and hybrid RANS/LES for acoustic waves generation and propagation ...
Xiao Wang, Shanti Bhushan, Adrian Sescu, Edward Luke, Bukhari Manshoor, Yuji Hattori   +5 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

Facilitating aerospace engineering senior design: Integrating lab curriculum redesign with student project and new technologies

Engineering Reports, Volume 6, Issue 11, November 2024.
This study investigates the impact of a redesigned aerodynamics laboratory course on students' readiness for Aerospace Engineering senior design projects at North Carolina State University. The updated curriculum, centered on propellers and incorporating Additive Manufacturing, introduces anechoic chambers for the first time.
Mingtai Chen
wiley   +1 more source

Finite difference time domain discretization for room acoustic simulation based on the non-linear Euler equations

Acta Acustica
In comparison to geometric acoustics, wave-based simulation techniques in the time domain have a much higher degree of accuracy. Latest modeling techniques like immersed boundaries reduce modeling effort significantly.
Hölter Arne, Weinzierl Stefan, Lemke Mathias   +2 more
doaj   +1 more source

Acoustic Propagation in the Near‐Surface Martian Atmosphere

Journal of Geophysical Research: Planets, Volume 129, Issue 7, July 2024.
Abstract This work introduces a comprehensive model of sound propagation on Mars, in light of the recent operation of several microphones on the Martian surface. The main outcome of this work is an operational acoustic model capable of simulating the sound field created by any source, at any location on the Martian surface, at any time.
Martin Gillier, Andi Petculescu, Alexander E. Stott, Naomi Murdoch, Xavier Jacob, Baptiste Chide, Sylvestre Maurice, David Mimoun   +7 more
wiley   +1 more source

Approximate computation of acoustic reflection and shadow effects using the Kirchhoff method

Acta Acustica
The article presents a fairly simple way to take solid bodies into account in acoustic radiation calculations using integral methods, while still using the free-space Green’s function.
Rahier Gilles, Peyret Christophe
doaj   +1 more source

Fluidic Ultrasound Generation for Non‐Destructive Testing

Advanced Materials, Volume 36, Issue 18, May 2, 2024.
Air‐coupled ultrasound enables material characterization and fault detection for specimens that are very large or do not allow contact with other materials. This study presents a novel fluidic transducer that can withstand harsh environments and generates a high‐amplitude ultrasonic signal without impedance mismatch to air.
Benjamin Bühling, Stefan Maack, Christoph Strangfeld   +2 more
wiley   +1 more source

Simulating Stirred Tank Reactor Characteristics with a Lattice Boltzmann CFD Code

Chemical Engineering &Technology, Volume 47, Issue 3, Page 586-595, March 2024.
There is a need for reliable models of mixing in stirred tanks, which is widely used in the chemical and process industry but complex and not fully understood. A lattice Boltzmann code with a large eddy simulation turbulence model was used to determine power numbers and mixing times in stirred tanks with different impellers.
Jule Kersebaum, Steffen Flaischlen, Julia Hofinger, Gregor D. Wehinger   +3 more
wiley   +1 more source

Biofilm therapy for chronic wounds

International Wound Journal, Volume 21, Issue 2, February 2024.
Abstract Chronic wounds have been a major factor of serious harm to global public health. At present, it is known that almost all chronic wounds contain biofilms, which seriously hinder the healing process. Removal of biofilms can effectively promote the healing of chronic wounds.
Yang Liu, Shengyong Long, Hanfeng Wang, Yan Wang   +3 more
wiley   +1 more source