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Resonances in Open Systems

Koch, W. (2004) Resonances in Open Systems. Kyoto University, Kyoto/Japan, 15.12.2004.

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In a short introduction examples of open resonators with acoustic, electromagnetic, elastic and water waves are given. A simple one-dimensional model problem is used to introduce the concept of 'leaky modes' which radiate energy. Numerically we employ 'perfectly matched layers (PML)' to solve such radiation problems. In wave guide problems so-called 'trapped modes' can occur in addition to leaky modes. Trapped modes do not radiate energy and are therefore important in applications. A well known example are the 'Parker modes' in wind tunnel testing, heat exchangers or turbomachinery cascades. Finally, as an example of a two-dimensional open resonator we compute the resonances in a classical laser cavity. The acoustic analogon is the 'gap tone' problem which is of importance in airframe noise. Two examples of the latter, namely 'cavity noise' and 'slat noise' are discussed briefly. The latter is still part of ongoing research.

Item URL in elib:https://elib.dlr.de/13056/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Resonances in Open Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:resonances, trapped and leaky modes, cavity noise
Event Title:Kyoto University, Kyoto/Japan, 15.12.2004
Organizer:Kyoto Center of Excellence
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: DLR-Beauftragter, elib
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:54

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