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A wing rock is known to be a self-excited rolling oscillation of a delta wing that is induced by unsteady aerodynamic forces. In previous studies, we carried out coupled simulations of a flow simulation (CFD) and an equation of motion of a delta wing to reproduce and understand a wing-rock motion observed by low-subsonic wind-tunnel experiments. The objective of the present study is to simulate high-subsonic wing rock phenomena and compare simulations with the visualized flow data by the latest experiments. A numerical model of a friction torque around the rolling axis in the experiment is introduced to search the reason for the discrepancies between the experiments and the simulations. Unsteady pressure changes on the wing obtained by the pressure sensitive paint (PSP) technique show reasonable agreements.

Analyses of High-Subsonic Wing Rock Phenomena by CFD