菱形角柱群まわりの流れ場に対するクラスタリングに関する研究

抄録

A flow field clustering technique was developed under the assumption that all the obtained flow fields were generated by generators expressed by Gaussian mixture distributions. Each generator was considered to have informative features of the flow fields. This technique was applied to a flip-flop flow around diamond-shaped cylinders arranged in a staggered formation, obtained experimentally by two-dimensional PIV (particle image velocimetry) at the Reynolds number of 2000. A temporal ordering of the generators indicated that the flow in this study was periodic. The flow fields of the generators captured fluctuations around wakes from the diamond-shaped cylinders. It was found that the flip-flop flow was maintained both by the mixing between the main flow and the wake on one side of the wake, and a locally enlarged main flow on the other side of the wake.