지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2012.11
- 수록면
- 439 - 443 (5page)
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초록· 키워드
오류제보하기
The present large eddy simulation (LES) study focuses on the case of developing flow within wide channels containing at the bottom wall an array of 2D dunes (2a/h=0.25, l/h=3.75, / is the wavelength, 2a is the dune height, h is the mean channel depth) of closer shape to the ones observed in natural streams. For the case of an incoming steady flow, the instantaneous flow fields are characterized by the formation of arrays of highly-organized hairpin vortices whose dimensions scale with the dune height. LES shows that for shallow channels (2a/h>0.25), the large-scale hairpins and the streaks penetrate regularly up to the free surface, thus affecting mass transport and mixing over the whole water column. LES shows that the hairpin eddies play the primary role in the formation of the streaks of high and low momentum over the region containing dunes. The presence of resolved turbulence in the incoming flow reduces the streamwise distance needed for the streaks to develop over the rough bed region, but does not affect qualitatively the transition process toward the fully developed flow regime, nor the spacing of the streaks in the fully-developed flow region.
목차
1. 서론
2. 수치 방법 및 계산 조건
3. 계산 결과
4. 결론
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UCI(KEPA) : I410-ECN-0101-2014-422-000810969