Analysis of backwater and flow field characteristics of skew bridge in river channel
Round-end pier is a common type of bridge pier in plain rivers.In order to investigate the changes of backwater characteristics and flow patterns caused by different arrangements of obliquely intersecting round-end piers,a three-dimensional flume numerical model is established,the SIMPLE algorithm coupled with k-εturbulent flow model is used to solve the N-S equation system,the VOF method is applied to trace the free liq-uid surface,and the changes of backwater characteristics,bypass flow field and lift-resistance coefficients of a single pier with the angle of obliquity are analyzed.The results show that:the effect of backwater in front of the downstream pier is the largest in height and the longest in length,and the impulse height in front of the up-stream pier is the largest.The current flows around the upstream pier and deviates to the downstream pier side,the larger the angle of oblique crossing,the backwater superposition effect formed by the bypassing flow is more obvious.The round-end piers are suggested to be arranged along the water flow when building an ob-lique crossing bridge,which can effectively reduce the water blocking width,backwater height and the impact on flow field.
skew bridgenumerical simulationround-end pierpier layoutbackwaterflow field
万方数据
维普
