Experimental and Numerical Investigation of the Flow Hydraulic in Gradual Transition Open Channels
| Autor: | Amir Ahmad Dehghani, Ali Akbar Akhtari, Hossein Bonakdari, Adel Asnaashari |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Turbulence Flow (psychology) 02 engineering and technology Reynolds stress Mechanics Supercritical flow Physics::Fluid Dynamics symbols.namesake Hydraulic head Flow separation 0202 electrical engineering electronic engineering information engineering Froude number symbols Shear stress 020201 artificial intelligence & image processing Water Science and Technology |
| Zdroj: | Water Resources. 45:565-577 |
| ISSN: | 1608-344X 0097-8078 |
| DOI: | 10.1134/s0097807818040036 |
| Popis: | Channel expansions are common in both natural and artificial open channels. With increasing cross-sectional dimensions in an expansion, the flow decelerates. Due to separation of flow and subsequent eddy formation, a significant head loss is occurred along the transition. This study presents the results of experimental investigations on subcritical flow along the expansive transition of rectangular to trapezoidal channels. Also, a numerical simulation was developed using the finite volume method with Reynolds Stress turbulent model. Water surface profiles and velocity distributions of flow through the transition were measured experimentally and compared with the numerical results. Also, hydraulic efficiency of the transition and coefficient of energy head loss were calculated. The results show that with increasing the upstream Froude number, hydraulic efficiency of the transition and coefficient of energy head loss are decreased and increased, respectively. The results also showed the ability of numerical simulation for simulating the flow separation zones and bed shear stress along the transition for different inlet discharges and inflow Froude numbers. |
| Databáze: | OpenAIRE |
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