Abstract
First, we found various ways to reduce the air resistance to the train by studying some papers in the past years, and we selected the circular hole as the main subject of our study. After that, we used computational fluid dynamics to determine the main source of drag on the prototype, explore why the circular pit can reduce drag, and analyze how to make the circular pit have the best drag reduction effect. Finally, we selected the shape, spacing, and size of the circular pit. We clarified why our selected circular pit has the best drag reduction effect by the mechanism of the circular pit. It is clear that a 20 mm diameter 40 mm pit has the best effect, which can reduce about 2.79% of the resistance.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
