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RISS 인기검색어
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- 발행기관 : International Association for Hydraulic Research (검색결과 2 건)
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Numerical study of flow dynamics around a stream restoration structure in a meandering channel
KANG, SEOKKOO,SOTIROPOULOS, FOTIS International Association for Hydraulic Research 2015 Journal of hydraulic research Vol.53 No.2
<P> In this paper the flow around a streambank-attached in-stream structure - rock vane - installed in a meandering channel is investigated via large-eddy simulation (LES). LES is carried out for the case where the rock vane is installed along the outer bank of a field-scale, natural-like experimental meandering channel facility. Analysis of the simulated flow field shows that the rock vane acts to displace the upstream high-velocity core toward the channel centre and it effectively reduces the bed shear stress along the outer streambank. It is also found that the presence of the rock vane gives rise to the growth of the secondary flow cell formed along the outer streambank, which is often called the outer bank cell. Numerical results suggest that the growth of the outer bank cell and the subsequent displacement of the outer bank shear layer are responsible for the displacement of channel thalweg toward the channel centre. </P>
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Numerical model for flood routing with a Cartesian cut-cell domain
KIM, HYUNG-JUN,CHO, YONG-SIK International Association for Hydraulic Research 2011 Journal of hydraulic research Vol.49 No.2
<P>Flood risk analysis requires adequate numerical modeling to estimate the inundation depth and velocity in a wide-ranging study area. Thus, accurate, simple, and efficient numerical models with adequate mesh systems are needed for large-scale flood simulations. A numerical model based on a finite volume approach with the Cartesian cut-cell method is adopted herein to solve the shallow-water equations. To improve the representation of the flow domain, a modified cut-cell technique is suggested. The modified cut-cell mesh can be generated by a mesh merging process which needs two or more cut-cell meshes for different flow characteristic domains such as a compound meandering channel with steps. The modified cut-cell mesh indicated a reasonable flow domain to represent complicated domains. To verify the accuracy and stability of the present numerical model, various tests were performed and the obtained predictions compared with available exact solutions and laboratory measurements. A very reasonable agreement was observed.</P>
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