Aerodynamics simulations on a road racing of bicycles using multi-GPU Large Eddy Simulation based on mesh-refined lattice Boltzmann method

Hasegawa, Yuta   ; Aoki, Takayuki*; Kobayashi, Hiromichi*; Shirasaki, Keita*

We implement and perform a large-scale LES simulation for aerodynamics on a road racing of bicycles. The mesh-refined lattice Boltzmann method with coherent-structure Smagorinsky model is employed to perform a multi-GPU computing. The validation on alone running or group running of 4 cyclists had a good agreement with previous experiments or CFD simulations. As a large scale benchmark problem, the aerodynamics simulation on the group of 72 cyclists was performed using 192 GPUs for 4 days. This computational cost is enough reasonable to run the application studies.