NUMERICAL STUDY ON DIFFERENT TYPES OF WEIRS TO DETERMINE THEIR OPTIMALITY BASED ON THE HYDRAULIC AND STRUCTURAL CRITERIA

In this research, different types of weirs have been numerically investigated to determine the optimal design based on two hydraulic and structural criteria. FLOW ۳D and ABAQUS software were utilized for the hydraulic and structural analysis, respectively. The accuracy of the numerical models was verified with the available experimental and numerical results. In the hydraulic investigation, ۱۸ models of different types of weirs including rectangular (۶ models), square, triangular (۳ models), circular, ogee (۳ models), and labyrinth (۴ models) weirs were examined. In the structural study of weirs, there are ۱۳ models, including rectangular, square, triangular (۳ models), circular, ogee (۳ models), and labyrinth (۴ models) weirs were analyzed. The results of hydraulic analyzes showed that the dimensions of the rectangular weir significantly affect the output velocity. In triangular weirs, the highest energy dissipation will occur with an apex angle of ۴۵°, and with the increase of the apex angle in the ogee weir, more turbulence is observed in the downstream flow. In labyrinth weirs, by changing the shape of the weir from triangular to rectangular, the output velocity and also turbulence of the flow will be much less. According to the findings of the structural analyses, the increase of the apex angle in triangular weirs, the weir will be more critical, but the situation will be more suitable in ogee weirs. Additionally, the rectangular labyrinth weir performs the best structurally among the labyrinth weirs.

کلیدواژه ها:

Numerical study ، Weir ، Hydraulic analysis ، Structural analysis ، Optimal design