TY - JOUR ID - 81334 TI - Numerical Investigations of Two-Phase Flow on a Stepped Spillway under Various Conditions JO - Journal of Computational Applied Mechanics JA - JCAMECH LA - en SN - 2423-6713 AU - Parhizgar, Ehsan AU - Namazian, Zafar AD - Department of Civil Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran AD - Department of Mechanical Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran Y1 - 2021 PY - 2021 VL - 52 IS - 2 SP - 332 EP - 349 KW - Stepped Spillway KW - Rough surface KW - Hydrophobic to Superhydrophobic KW - Passive Control Method KW - energy dissipation KW - discharge KW - Falling Velocity DO - 10.22059/jcamech.2021.314069.573 N2 - In this study, two-phase flow over a three-dimensional stepped spillway was numerically investigated using a finite volume code in ansys-Fluent commercial software. The numerical results were validated against experimental data. Then, the effects of several parameters were evaluated on the structure of the flow over the concerned spillway. Based on the natural roughness, several roughness heights of 0.0001, 0.0005, and 0.001 m were considered on the spillway surface to investigate the flow structure. In the next step, several surfaces with different contact angles, including 80, 120, and 160°, were used. Finally, a passive control method, including simultaneous blowing and suction with different configurations, was applied to the steps of the spillway. The results revealed that a change in the surface roughness or contact angle and applying the control method could change the flow regime from skipping to nappe. Also, variations in the speed of falling water and energy loss were attributed to changes in the surface roughness and contact angle and implementation of the proposed control method. UR - https://jcamech.ut.ac.ir/article_81334.html L1 - https://jcamech.ut.ac.ir/article_81334_555995f59fe7b39fdf2da87e34ddb4b7.pdf ER -