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Impedance boundary condition in frequency domain DG code for modelling liner effects in complicated intake ducts.

Proskurov, Stanislav and Mößner, Michael and Delfs, Jan Werner (2022) Impedance boundary condition in frequency domain DG code for modelling liner effects in complicated intake ducts. In: AIAA Aviation 2022 Forum, pp. 1-18. 28th AIAA / CEAS Aeroacoustics Conference, 14-17 Jun 2022, Southampton, UK. doi: 10.2514/6.2022-2897.

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Official URL: https://arc.aiaa.org/doi/abs/10.2514/6.2022-2897


An impedance problem is fundamental to computing acoustic wave propagation. Here, the focus is on applying an impedance boundary condition derived from first principles for modelling a realistic acoustic liner. Simulations are performed in frequency domain where the Acoustic Perturbation Equations (APE) are solved with Discontinuous Galerkin (DG) method. In order to achieve a physical boundary layer - surface interaction, the APE propagation equations are solved on top of a wall-resolved RANS flow that is obtained from a precursor CFD simulation. Key findings include the analysis of a flux balance across the impedance boundary. Also, the method is applied to solve a challenging Unmanned Combat Aerial Vehicle (UCAV) problem with acoustic modes propagating in a complicated intake duct where it is hardly possible to establish an analytical solution. DLR F-24 MULDICON UCAV (MULti-DIsciplinary CONfig) test platform is used for demonstrating a low noise modification by inclusion of impedance boundary of a realistic size which is conveniently integrated into the duct for the ease of liner manufacture and service.

Item URL in elib:https://elib.dlr.de/189484/
Document Type:Conference or Workshop Item (Speech)
Additional Information:The work has been partly funded by AIRBUS Defence & Space
Title:Impedance boundary condition in frequency domain DG code for modelling liner effects in complicated intake ducts.
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Delfs, Jan WernerUNSPECIFIEDhttps://orcid.org/0000-0001-8893-1747UNSPECIFIED
Date:13 June 2022
Journal or Publication Title:AIAA Aviation 2022 Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-18
EditorsEmailEditor's ORCID iDORCID Put Code
Keywords:aeroacoustics, impedance boundary condition, discontinuous galerkin, intake liners, modelling, UAV
Event Title:28th AIAA / CEAS Aeroacoustics Conference
Event Location:Southampton, UK
Event Type:international Conference
Event Dates:14-17 Jun 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Unmanned Aerial Systems
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Proskurov, Stanislav
Deposited On:01 Nov 2022 10:23
Last Modified:11 Nov 2022 10:33

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