Results 61 to 70 of about 11,915 (202)

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

Turbomachinery Noise Review

International Journal of Turbomachinery, Propulsion and Power
The present paper is aimed at providing an updated review of prediction methods for the aerodynamic noise of ducted rotor–stator stages. Indeed, ducted rotating-blade technologies are in continuous evolution and are increasingly used for aeronautical ...
Stéphane Moreau, Michel Roger
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

Aerodynamics effects of rear-mounted porous plate in cylindrical flow at different Reynold numbers

Engineering Applications of Computational Fluid Mechanics
This paper conducts simulations to analyze the flow control characteristics of cylindrical flow over porous plates in the subcritical regime, utilising large-eddy simulation (LES) coupled with the Ffowcs Williams-Hawkings (FW-H) method.
Shishang Zhang, Tanghong Liu, Xiaodong Chen, Ye Zhang, Zhiqiang Kong, Qian Yu, Hongkang Liu   +6 more
doaj   +1 more source

Effect of rotor stiffness and lift offset on the aeroacoustics of a coaxial rotor in level flight [PDF]

, 2009
The acoustic characteristics of a twin contra-rotating coaxial rotor configuration with significant flapwise stiffness are investigated in steady forward flight.
Brown, Richard, Duraisamy, Karthikeyan, Kim, Hyo Wan   +2 more
core  

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

Improvement of a Free-Wake Model for the Aerodynamic and Aeroacoustic Analysis of a Small-Scale Two-Bladed Propeller in Hover

Aerospace
The aim of the present work is the improvement of a free-wake model for the analysis of a small-scale two-bladed propeller in hover. The simulations are carried out using a BEM approach implemented in the medium-fidelity solver RAMSYS.
Manuel Iannotta, Antonio Visingardi, Domenico Quagliarella, Fabrizio De Gregorio, Mattia Barbarino, Alex Zanotti   +5 more
doaj   +1 more source

Report on the final panel discussion on computational aeroacoustics [PDF]

Some important conclusions about future prospects for aeroacoustics in general, and for computational aeroacoustics in particular, that were reached in the course of the Final Panel Discussion of the Workshop on Computational Aeroacoustics held from 6 to
Lighthill, James
core   +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

Comparison of Prediction Models for Sonic Boom Ground Signatures Under Realistic Flight Conditions

Aerospace
This paper presents a comparative analysis of simplified and high-fidelity sonic boom prediction methods to assess their applicability in the conceptual design of supersonic aircraft. The high-fidelity approach combines Computational Fluid Dynamics (CFD)
Jacob Jäschke, Samuele Graziani, Francesco Petrosino, Antimo Glorioso, Volker Gollnick   +4 more
doaj   +1 more source