气候变化领域集成服务门户(CCPortal): SPH modelling of turbulent open channel flow over and within natural gravel beds with rough interfacial boundaries

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DOI	10.1016/j.advwatres.2020.103557
	SPH modelling of turbulent open channel flow over and within natural gravel beds with rough interfacial boundaries
	Kazemi E.; Koll K.; Tait S.; Shao S.
发表日期	2020
ISSN	0309-1708
卷号	140
英文摘要	Smoothed Particle Hydrodynamics (SPH) is brought to a level that can be applied to simulate turbulent open channel flows over and within natural porous gravel beds. For this, improvements have been made with regards to i) turbulence modelling, ii) open boundaries (inflow and outflow), and iii) treatment of the rough interface boundary between the porous bed and the overlying free-flow. Flow through the porous bed is simulated macroscopically, and the coefficients of the drag closure model are carefully determined for different layers of the flow; the effect of turbulence is taken into account using a three-layer mixing-length model; and a porous inflow boundary at the inlet as well as an imaginary pressure wall at the outlet are introduced to obtain the required steady and uniform flow conditions. The developed model is then used to simulate eight test cases with two bed conditions, each with four flow conditions. Through a velocity analysis, a nearly S-shaped profile is observed within the roughness layer for the present test cases. The comparison of the results of the velocity and shear stress with a set of experimental data for the test cases reveals that the SPH model with the present drag and turbulence closure models as well as the proposed inflow/outflow boundary techniques is capable of simulating complex turbulent channel flows over highly sheared natural porous gravel beds. © 2020 Elsevier Ltd
关键词	Drag Gravel Hydrodynamics Shear flow Shear stress Turbulence Different layers Interfacial boundary Roughness layers Smoothed particle hydrodynamics Turbulence closure models Turbulent channel flows Turbulent open channel flow Velocity analysis Open channel flow comparative study flow velocity gravel bed stream hydrodynamics inflow open channel flow porous medium roughness shear stress turbulent flow
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131812
推荐引用方式 GB/T 7714	Kazemi E.,Koll K.,Tait S.,et al. SPH modelling of turbulent open channel flow over and within natural gravel beds with rough interfacial boundaries[J]. Advances in Water Resources,2020,140.
APA	Kazemi E.,Koll K.,Tait S.,&Shao S..(2020).SPH modelling of turbulent open channel flow over and within natural gravel beds with rough interfacial boundaries.,140.
MLA	Kazemi E.,et al."SPH modelling of turbulent open channel flow over and within natural gravel beds with rough interfacial boundaries".140(2020).