This paper deals with numerical simulations of traveling-wave generated on a thin film subjected to a fluid flow in a narrow gap. In the modeling of the system, the thin film consists of some rigid bodies connected with rotational springs and dampers based on multi-body dynamics formulation. The nonlinear fluid forces acting on the rigid bodies are derived from the basic equations of leakage fluid flow in the narrow gap. The nonlinear equation of motion of the thin film coupled with the fluid flow is calculated numerically. By the numerical simulations, it is shown that the traveling-wave, which propagates in the same direction as the fluid flow, occurs to the thin film due to the fluid flow in the narrow gap and clarified the critical flow velocity and mode shape of the traveling-wave. Furthermore, the effect of the passage length on vibration characteristics and mode shapes of the traveling-wave are clarified. Moreover, the calculation results are verified by the experiments on the critical flow velocity and mode shape of the thin film.
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