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A HIERARCHICAL APPROACH TO DETERMINING ACOUSTIC ABSORPTION PROPERTIES OF POROUS MEDIA COMBINING PORE-RESOLVED AND MACROSCOPIC MODELS

Uphoff, Sonja and Krafczyk, Manfred and Kutscher, Konstantin and Rurkowska, Katherina and Langer, Sabine and Lippitz, Nicolas and Faßmann, Benjamin (2018) A HIERARCHICAL APPROACH TO DETERMINING ACOUSTIC ABSORPTION PROPERTIES OF POROUS MEDIA COMBINING PORE-RESOLVED AND MACROSCOPIC MODELS. Journal of Porous Media, 21 (1), pp. 83-100. Begell House. DOI: 10.1615/JPorMedia.v21.i1.50 ISSN 1091-028X

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Official URL: http://dl.begellhouse.com/journals/49dcde6d4c0809db,1b2e729115e0698d,6e3a1083478ff155.html

Abstract

Acoustic properties of porous media are very important for numerous industrial applications, the typical goal being to maximize broadband absorption to decrease the sound pressure level of the engineering system under consideration. Up to now acoustic absorption for porous media with complex inner geometry is determined experimentally, as acoustic simulations on the pore scale are computationally challenging due to the tedious geometric reconstruction of computer tomography (CT) data and the corresponding mesh generation as well as substantial computational requirements for the corresponding transient 3D solvers. The lattice Boltzmann method (LBM), which is an established computational approach to simulate pore-resolved porous media transport problems, has been used successfully for aeroacoustic setups and is utilized in this work to fill this gap. This paper presents a comparison of different experimental and numerical approaches to determine the acoustic absorption of different porous media. Experimental work with an impedance tube was carried out for comparison and CT scans were conducted to supply the detailed numerical simulation with geometry data of the porous samples. Results of LB simulations for the acoustic impedance of a microperforated plate and a felt are shown. Finally we demonstrate how microscopic parameters determined by a pore scale approach can be used to feed homogenized models to bridge the gap towards simulations of components where acoustic absorbers are applied to, e.g., wing flaps of airplanes.

Item URL in elib:https://elib.dlr.de/120413/
Document Type:Article
Title:A HIERARCHICAL APPROACH TO DETERMINING ACOUSTIC ABSORPTION PROPERTIES OF POROUS MEDIA COMBINING PORE-RESOLVED AND MACROSCOPIC MODELS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Uphoff, SonjaTU Braunschweig, Institut für rechnergestützte Modellierung im BauingenieurwesenUNSPECIFIED
Krafczyk, ManfredTU Braunschweig, Institut für rechnergestützte Modellierung im BauingenieurwesenUNSPECIFIED
Kutscher, KonstantinTU Braunschweig, Institut für rechnergestützte Modellierung im BauingenieurwesenUNSPECIFIED
Rurkowska, KatherinaTU Braunschweig, Institut für KonstruktionstechnikUNSPECIFIED
Langer, SabineTU Braunschweig, Institut für KonstruktionstechnikUNSPECIFIED
Lippitz, NicolasTU Braunschweig, Institut für WerkstoffeUNSPECIFIED
Faßmann, Benjaminbenjamin.fassmann (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Porous Media
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:21
DOI :10.1615/JPorMedia.v21.i1.50
Page Range:pp. 83-100
Publisher:Begell House
ISSN:1091-028X
Status:Published
Keywords:acoustic absorption, lattice Boltzmann, pore scale acoustics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Faßmann, Benjamin
Deposited On:18 Jun 2018 09:50
Last Modified:06 Sep 2019 15:21

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