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.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Resonances in Open Systems|
|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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