Determination of temporal and spatial origination of transonic buffet via unsteady data mining

The Betti sequence which is one of the topological data analysis has been applied to the time series dataset in which a transonic buffet occurred. In this project, we aim to find temporal and spatial originations of transonic buffet by data analyses, therefore, numerical fluid analysis is performed by unsteady detached eddy simulation which sweeps angle of attack, then datasets are created. In this paper, as the first trial, we set up six monitoring points in the vicinity where the transonic buffet passes on the wing upper surface; the Betti sequence was applied to the x-directional velocity and the pressure. As a result, on the wing surface, the Betti sequence only responded to the pulse of the physical quantity, as the disturbance of the physical quantities by the separation behind the shockwave and that by the transonic buffet are similar. Other monitoring points should be provided outside the separation region.