The influence and improvement of curved water flow on the flow pattern downstream of bridge piers
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Abstract:
In practical engineering, bridge piers are frequently located within the influence of bending water flow. When there is a deviation in the flow upstream of the bridge pier, the low-velocity area created by the shedding of vortices downstream of the bridge pier interacts with the deviation flow. This leads to a highly uneven distribution of flow velocity downstream, posing a hazard to the downstream slopes and related buildings. To improve the disturbance of flow pattern downstream of the bridge pier caused by curve flow, a method of k-ω SST 3D numerical simulation and physical model test were established based on ANSYS Fluent. The influence of different pier tail shapes on downstream velocity distribution was studied, and the causes of downstream deviation were analyzed. The findings indicated that when the incoming flow upstream shifted and the relative velocity difference between the shifted flow and the low-velocity area behind the pier increased, it led to an increase in turbulence in the downstream flow. Enhancing the design of the downstream end of the pier can improve the distribution of velocity downstream. The length of the tail end of the pier had a positive correlation with the steady flow effect, while the radius of the arc at the front end of the pier had a negative correlation with the steady flow effect in the scope of this study. The research results can reference related projects such as bridge pier construction in curved water flow.
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