Study of Hydraulic Jump in a Stilling Basin with Sinusoidal Bed Using Flow3D Model

Subject Areas : watere sciences

Seied Mohammad Tabatabaei ¹ , Mohammad Heidarnejad ² , Amin Bordbar ³

1 - 1Department of Water Science Engineering, khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran
2 - 2 Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 - Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

Received: 2017-02-13 Accepted : 2017-04-14 Published : 2016-03-20

Keywords: hydraulic jump, Stilling basin, sinusoidal bed, Flow 3D model,

Abstract :

Due to the importance of stilling basin blocks and the significant effect of their shape and dimension on energy dissipation, and since various studies have been carried out on hydraulic jump properties and properties of stilling basins while fewer studies have addressed the effect of integrated sinusoidal blocks on hydraulic jump properties, the present research was designed to analyze the effect of sinusoidal blocks height using the Flow 3D model, which is a powerful software product for simulating flow turbulence in two or three dimensions. Froude numbers in this research ranged from 4.6 to 12.2, which indicated that as flow’s Froude number increases from 4.2 to 11, the length of roller and hydraulic jump escalate. Moreover, relative roller length changes for about 30% to 40% by changing the height of blocks. Consequently, jump submerges in the beginning of outflow of flow from below the vent and output flow dissipates quickly. Jump length also decreases with an increase in blocks height. Finally, roller length decreases by 40 to 50 cm with outflow of flow from below the vent for the following two values: (The wave steepness) t/s=0.25 and 0.75.