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  • RecurDyn (리커다인)
  • 국내학술지

    186 0
    국내학술지 제목 게시판 내용
    제목(국문) 파형벽면이 있는 채널 유동의 응집 구조 연구
    제목(영문) COHERENT STRUCTURES IN DEVELOPING FLow OVER A WAVY WALL
    저자 장경식 (Kyoung Slk Chang ,한서대학교 항공기계학과 ) ▷공저자 네트워크 보기
    초록

    -

    초록(영문)

    The present study focuses on the case of developing flow with in a channel containing a long array of
    sinusoidal waves (2a/λ=0.1 , λ=h, λ is the wavelength, 2a is the wave height, h is the mean channel depth) at the bottom wall. The Reynolds number deflned with channel height, h and the mean velocity, U, is Re=6,700. The channel is sufficiently long such that transition is completed and the flow is fully developed over the downstream half of the channel. For the case of an incoming steady flow with no resolved turbulence, the instantaneous flow fields in the transition region are characterized by the formation of arrays of highly-organized large-scale hairpin vortices whose dimensions scale with that of the roughness elements. The· paper explains the mechanism for the formation of these arrays of hairpin vortices and shows these eddies play the primary role in the formation of the large-scale streaks of high and low velocity over the wavy wall region. The presence of resolved turbulence in the incoming flow, reduces the streamwise distance needed for the streaks to develop over the wavy region, but does not affect qualitatively the transition process. In the fully-developed region, isolated and trains of large-scale hairpins play an important role in the dynamics of the streaks over the wary wall.

    keyword roughness wall, Wavy Wall, Coherent structures, Large Eddy Simulation
    표면조도, 파형 벽면, 응집 구조, 대와류모사
    저널명 한국전산유체공학회지 ▷관련저널보기
    VOL 17
    PAGE 93-99
    발표년도 2012
    원문파일 국문다운로드
    • 페이스북아이콘
    • 트위터 아이콘

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