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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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Abstract

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.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Resonances in Open Systems
Authors:
AuthorsInstitution or Email of Authors
Koch, W.UNSPECIFIED
Date:2004
Status:Published
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
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:54

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