| Abstrakt: |
This numerical simulation studies the effect of the varying Reynolds number on the aerodynamic performance of the high-speed train design. Scaling the geometry and varying the flow velocity changes the Reynolds. This study investigates the use of geometry scaling, as often performed in the wind tunnel test, and finds the independent value of the drag coefficient to the Reynolds number. There are two types of geometric scales used; a full scale at a speed of 30 m/s, 50 m/s, 83.33 m/s; and a scaled geometric of 1:10 at varying velocities of of 10.5 m/s, 30 m/s, 50 m/s, and 83.33 m/s. Numerical simulation was performed using ANSYS Fluent software with a steady and incompressible flow. Results showed that increasing the Reynolds numbers from 2.5 x 105 to 2.05 x 107 caused a reduction in the boundary layer thickness, drag coefficient, and negative peak of pressure coefficient on the surfaces of the train. In the range of Reynolds numbers between 7.4x106 to 2.05x107, the change of drag coefficients is no more than 5%. [ABSTRACT FROM AUTHOR] |
