Line Shape of Boundary Transition Section of Terrain Model at Bridge Sites in Complex Mountainous Areas
The curve of the transition section of the terrain model at bridge sites in complex mountainous areas directly affects the accuracy of the wind tunnel experiment or numerical simulation results.To study the ideal form of line shape used in the boundary transition section of the terrain model at the bridge site,the principle of constructing line shape of the transition section was put forward based on the two ideas of setting up the transition section.The numerical simulation method was used to compare the three types of typical line shapes of the transition section in terms of the flow separation characteristics,mean wind speed profiles,wind attack angle profiles,and distribution of turbulent kinetic energy along the route under the uniform flow.The influence law of the slope change of the transition section on the flow field was also explored.The results show that the sine-squared curve exhibits superior characteristics compared with other line shapes,with a maximum shear stress difference of 3.77×10-3 Pa at the same location in terms of flow separation characteristics,a maximum wind speed difference of 0.09 m/s in terms of transitional performance of wind,and a maximum turbulent kinetic energy difference of 1.46×10-3 J.These findings provide important insights for selecting the line shape of the transition section of the terrain model at bridge sites.
complex mountainous areasterrain modeltransition sectionwind field characteristicsnumerical simulation
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