Wind-sand flow simulation and radius optimization of highway embankment under different vertical curve radius

It is of great practical value to explore the correlation between the vertical curve radius of desert highway and the increase of sand accumulation in local lines, and to select the appropriate vertical curve radius for reducing the risk of sand accumulation. In this study, three-dimensional models of desert highway embankments with different vertical curve radii were constructed, and Fluent software was used to simulate the wind-sand flow field and sand accumulation distribution of vertical curve embankments. The results show that: (1) Along the direction of the road, the concave and the convex vertical curve embankments have the effect of collecting and diverging the wind-sand flow, respectively. When the radius of the concave vertical curve is 3000 m, 5000 m, 8000 m, 10000 m and 20000 m, the wind velocity in the middle of the vertical curve is 31.76