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DOI | 10.1029/2019GL084098 |
On the Role of Sidewalls in the Transition From Straight to Sinuous Bedforms | |
Zgheib, N.1,2; Balachandar, S.2 | |
2019-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:16页码:9612-9619 |
文章类型 | Article |
语种 | 英语 |
国家 | Lebanon; USA |
英文摘要 | We present results from direct numerical simulation on the transition from straight-crested to sinuous-crested bedforms. The numerical setup is representative of turbulent open channel flow over an erodible sediment bed at a shear Reynolds number of Re-tau = 180. The immersed boundary method accounts for the presence of the bed. The simulations are two-way coupled such that the turbulent flow can erode and modify the bed, and in turn, the bed modifies the overlying flow. Coupling from the flow to the bed occurs through the Exner equation, while back coupling from the bed to the flow is achieved by imposing the no-slip and no-penetration condition at the immersed boundary. The simulation setup is similar to that by Zgheib et al. (2018a, https://doi.org/10.1002/2017JF004398) except for the presence of sidewalls to better mimic laboratory flume conditions. Sidewalls are observed to significantly increase bedform sinuosity. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700035 |
WOS关键词 | DIRECT NUMERICAL-SIMULATION ; IMMERSED BOUNDARY METHOD ; FLAT SAND-BED ; CURRENT RIPPLES ; INITIATION ; TURBULENCE ; DYNAMICS ; CURRENTS ; CHANNEL ; FLOW |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186245 |
专题 | 气候变化 |
作者单位 | 1.Lebanese Amer Univ, Sch Engn, Byblos, Lebanon; 2.Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA |
推荐引用方式 GB/T 7714 | Zgheib, N.,Balachandar, S.. On the Role of Sidewalls in the Transition From Straight to Sinuous Bedforms[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9612-9619. |
APA | Zgheib, N.,&Balachandar, S..(2019).On the Role of Sidewalls in the Transition From Straight to Sinuous Bedforms.GEOPHYSICAL RESEARCH LETTERS,46(16),9612-9619. |
MLA | Zgheib, N.,et al."On the Role of Sidewalls in the Transition From Straight to Sinuous Bedforms".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9612-9619. |
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