Numerical modeling of unsteady flow: implicit scheme revisited
محل انتشار: یازدهمین کنگره ملی مهندسی عمران
سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 472
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شناسه ملی سند علمی:
NCCE11_200
تاریخ نمایه سازی: 9 شهریور 1398
چکیده مقاله:
The movement of flow in open channels and natural streams is basically governed by the continuity and momentum equations. These equations consist of a system of partial differential hyperbolic equations while various analytical and numerical methods have been recommended for solving this system. In this study, the formulation of a robust four -point implicit scheme is revisited with the step-by-step derivation details. By applying this scheme, the governing equations turns into a system of nonlinear algebraic equations, which can be solved iteratively using the generalized Newton-Raphson scheme. Although the value of resistance coefficient has an inevitable impact on the routing results, the effect of inappropriate estimation of the roughness coefficient has not been quantified in the hydraulic flow routing results. The conducted numerical experiment demonstrates that the routing results are significantly affected by the selected values for Manning’s coefficient
کلیدواژه ها:
Open channel hydraulics ، hydraulic flow routing ، implicit finite difference scheme ، resistance equation ، Manning’s coefficient.
نویسندگان
Majid Niazkar,
Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran
Nasser Talebbeydokhti,
Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran
Seied Hosein Afzali
Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran