Simulation Example - Streamlining in High-Speed Rail Transport


In this simulation example, we will explore the use of external flow analysis to analyze the air flow around high-speed trains. Such simulations are used by engineers to understand the flow of air around a train as it moves at high speeds and to estimate the resulting drag forces. Better understanding of these loads has enabled engineers to come up with innovative, streamlined designs to tackle induced drag forces and make trains more efficient. In this example, we will be simulating flow around two trains: an old train and a new “streamlined” bullet train. We will set up a simple flow simulation around these two trains and then use it to analyze the key features of the flow.


In this simulation example, you will learn :

  • How to simulate the air flow around scale models of trains in Ansys Fluent.
  • How to create and analyze pressure and wall shear stress contours.
  • How to analyze the flow field using velocity vectors and pathlines.


Download the Mesh file needed for setting up the simulation and the associated Case and Data files here. Follow the instructions below to set up this simulation in Ansys Fluent starting with the Mesh file. In case you face any issues setting up or running the simulation, please use the corresponding initial and final Case and Data files.

Alternate video link.

Results and Discussion

Let's now analyze the simulation results and understand how streamlining works.