지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2012.11
- 수록면
- 1,074 - 1,078 (5page)
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초록· 키워드
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Particle motion in turbulence is of major interest in many engineering fields such as coastal and environmental researches. Whereas most boundary conditions for particle motion in turbulence are rough in practice, studies on particle motion still focus on the particle motion over a flat boundary. Since the turbulence generated by rough boundaries is different from that in flat boundaries, detailed study about particle motion along rough boundary is needed. In this study, turbulence over wavy wall is investigated by spectral method. Virtual boundary method proposed by Goldstein et al. (1995) is used to impose no-slip condition at wavy virtual boundary. Also, behavior of particles in turbulence over wavy boundary is investigated by particle tracking. Simulation results are compared with the characteristics of turbulent flow over a wavy wall described in papers for evaluation. Focusing on the effect of wavy boundary on turbulent structures, simulation results from wavy boundaries with different amplitude and wavelength are compared. Streamwise vortices and low-speed streaks, which associate with particle clustering, mainly develop from the upslope region with lengthscale of wavelength in wavy wall cases. Statistics of particle concentration and motion are investigated for inertial particles released in each flow case. In common, particle concentration is high in upslope region and particle velocity and its fluctuation show different characteristics in each flow case and particle inertia.
목차
Abstract
1. 서론
2. 수치모의
3. 파상의 경계면을 지나는 난류 특성
4. 결론
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UCI(KEPA) : I410-ECN-0101-2014-550-000189233