Calculation method for open channel flows with multi-scale roughness in gravel bed rivers based on dynamic wall law

2017 Fiscal Year Final Research Report

• Project/Area Number: 26420505
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Hiroshima University (2017); Chuo University (2014-2016)
• Principal Investigator: Uchida Tatsuhiko 広島大学, 工学研究科, 准教授 (00379900)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 開水路流れ / 準三次元解析 / 粗面抵抗則 / 多重スケール / 跳水 / 礫床河川 / 非平衡流砂 / 二相流

Outline of Final Research Achievements

This study proposed a new calculation method, GBVC4-DWL, which was developed by coupling General Bottom Velocity Computation (GBVC) method with Dynamic Wall Law to calculate three dimensional flow structures and complex bottom velocity fields in open channel flows in the frame work of two dimensional computation method. The dynamic wall law allows us to calculate bottom velocity dynamically based on continuity and momentum equations for bottom thin layers of vortex and roughness layers without assuming equilibrium flow condition, such as log law velocity distribution, for the bottom boundary condition for the computation of three dimensional flows. The method has been validated though the comparison with experimental data not only for three dimensional flow structures with multi-scale toughness, but also for bed variation analysis.

Free Research Field

水工水理学