運動量方程式に基づく複断面直線開水路乱流における二次流の生成機構の考察

Generation mechanism of secondary flow in a straight compound open channel based on momentum equations

佐藤 弘行

河原 能久

水工学論文集

Large eddy simulation of fully developed turbulent flow in a compound open channel was carried out using the Smagorinsky model. The Reynolds number based on hydraulic radius and cross sectional averaged velocity is 5300. The mechanism of secondary flow is discussed by evaluating terms in the momentum equations for mean secondary flow. To clarify the important role of pressure gradients in driving the secondary currents, pressure is decomposed into several components that account for the contributions of convection, external force, the Reynolds stresses, and the viscosity. It is found that not only the Reynolds stresses but also the pressure gradients induced by the normal and shear Reynolds stresses play a major role in generating secondary flow.

Compound Open Channel

Turbulent Flow

Large Eddy Simulation

Smagorinsky Model

Reynolds Stress

Secondary Flow

建設工学・土木工学 [ 510 ]

日本語

土木学会

[ISSN] 0916-7374

[NCID] AN10426673