개수로 조도계수에 따른 유효 벽면거칠기Effective Wall Roughness corresponding to Roughness Coefficient of Open Channel Flow
- Other Titles
- Effective Wall Roughness corresponding to Roughness Coefficient of Open Channel Flow
- Authors
- 윤성범; 최준우; 권갑근; 김형석
- Issue Date
- Mar-2008
- Publisher
- 한국전산유체공학회
- Keywords
- Open channel; RANS; wall function; wall roughness; Manning' s coefficient
- Citation
- 제5차 한국유체공학 학술대회 논문집, pp.176 - 179
- Indexed
- OTHER
- Journal Title
- 제5차 한국유체공학 학술대회 논문집
- Start Page
- 176
- End Page
- 179
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/42601
- Abstract
- In a numerical simulation of open channel turbulent flows, the determination of wall roughness height for wall function was studied. The roughness constant, based on the law-of-the -wall for flow on rough walls, obtained by experimental works for pipe flows is employed in general wall functions. However, this constant of wall function is the function of Froude number in open channel flows. Thus, the wall roughness should be determined by taking into account the effect of Froude number. In addition, the wall roughness should be corresponding to Manning's roughness coefficient widely used for open channels. In this study, the relation between wall roughness height as an input condition and Manning's roughness coefficient was investigated, and an equation for effective wall roughness height considering the characteristics of numerical models was proposed as a function of Manning's roughness coefficient.
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