Application of SSIIM numerical model in simulation of local scouring around the aerodynamic bridge pier located in 90 ° bend

Bridges are one of the most important and widely used river structures. Every year, a large number of them are destroyed by factors such as scouring and erosion. It is sometimes observed that the bridges are placed in the river bend, due to restrictions such as the road construction or river instability. On the other hand, studies have shown that the geometric shape of the bridge pier will have significant effect on the depletion of flow energy and thus reduce the scour depth around the bridge pier. Therefore, in this study, the effect of bend angle changes on flow pattern and local scouring around the of cylindrical bridge piers with aerodynamic shapes were investigated. SSIIM Three-dimensional software was used for modeling. The results showed that by increasing the bend angle and also placing the pier with a wide nose upstream, the amount of depth and volume of scouring increases, so that, the maximum depth and volume of scour occurred at a 90-degree angle to 0.1197123 m and 0.08436892 cubic meters, respectively.