シンセティックジェットによる円形噴流にヘリカルモードの形成のための数値実験

抄録

In our previous research, we have been able to form branching flows corresponding to the number of excitation holes by adding synthetic jets to a round jet. We expect that a helical vortex structure is formed in the initial region of a round jet by adding a phase difference to the synthetic jets. Numerical simulations are carried out using an open source software OpenFOAM. It is confirmed that the helical vortex structure is produced in the initial region of the round jet. The formed helical-vortex-structure is visualized by the second invariant of velocity gradient tensor Q, in terms of the number of excitation holes, the amplitude, and the excitation frequency of the synthetic jets.