Werner Koch 博士 特別講演会

日時: 2004年12月15日(水) 16:00〜17:00
場所: 京都大学大学院工学研究科 航空宇宙工学専攻 工学部11号館2階 第2講義室
講演者: Dr Werner Koch (DLR Institute of Aerodynamics and Flow Technology, Gottingen, GERMANY)
講演題目: Resonances in Open Systems
講演要旨: 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.

京都大学大学院 工学研究科 機械工学専攻 機械物理工学専攻 精密工学専攻 航空宇宙工学専攻
情報学研究科 複雑系科学専攻
京都大学 国際融合創造センター
拠点リーダー 土屋和雄(工学研究科・航空宇宙工学専攻)
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