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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.6
- 수록면
- 93 - 99 (7page)
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초록· 키워드
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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 defined 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 wavy wall.
목차
1. 서론
2. 수치 방법 및 계산 조건
3. 계산 결과
4. 결론
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참고문헌
참고문헌 (15)
참고문헌 신청
1. [학술지(정기간행물)] - Gong, W / 1996 / Turbulent boundary layer flow over fixed aerodynamicallyrough two-dimensionally sinusoidal waves / Journal of FluidMechanics 312 : 1 ~ 37
2. [학술지(정기간행물)] - Grass, A.J / 1991 / Vortical structures and coherent in tubbulent flow oversmooth and rough boundaries / Philosophical TansactionsRoyal Society of London A 336 : 35 ~ 65
3. [단행본] - Defina, A / 1996 / Transverse spacing of low-speed streaks in a channel flow over a rough bed, In Coherent Flow Structures in Open Channel / John Wiley
4. [학술지(정기간행물)] - Hudson, J.D / 1996 / Turbulence production in flow over a wavy wall / Experiments in Fluids 20 : 257 ~ 265
5. [학술지(정기간행물)] - Günther, A. / 2003 / Large scale structures in a developed flow over awavy wall / Journal of Fluid Mechanics 478 : 257 ~ 285
2. [학술지(정기간행물)] - Grass, A.J / 1991 / Vortical structures and coherent in tubbulent flow oversmooth and rough boundaries / Philosophical TansactionsRoyal Society of London A 336 : 35 ~ 65
3. [단행본] - Defina, A / 1996 / Transverse spacing of low-speed streaks in a channel flow over a rough bed, In Coherent Flow Structures in Open Channel / John Wiley
4. [학술지(정기간행물)] - Hudson, J.D / 1996 / Turbulence production in flow over a wavy wall / Experiments in Fluids 20 : 257 ~ 265
5. [학술지(정기간행물)] - Günther, A. / 2003 / Large scale structures in a developed flow over awavy wall / Journal of Fluid Mechanics 478 : 257 ~ 285
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UCI(KEPA) : I410-ECN-0101-2013-422-002692307