A kind of Vshape valveless piezoelectric pump with single oscillatordual chamber was designed and its geometric model was created.Its internal flows were numerically analyzed by the dynamic mesh model in Fluent. The unsteady flow field in the piezoelectric pump was simulated and the pump unsteady characteristics, such as instantaneous pressure, velocity and flow rate in different periods of time, were obtained. If the dynamic characteristics of the twochip piezoelectric vibrator was effectively combined with the fluid dynamics, the estimated pump performance would agree with the theoretical characteristics of valveless piezoelectric pumps, it is suggested that the dynamic mesh model is feasible in the numerical simulations of flow in such a pump. The effects of driving frequency, amplitude of the piezoelectric vibrator, pump chamber height and location of the Vtube on the pump output performance were studied by means of considerable numerical simulations. The simulation results show that the maximum outlet flow is obtained at the driving frequency of 250 Hz. Moreover， the greater the amplitude of the piezoelectric vibrator, the higher the outlet flow. When a set of amplitude, pump chamber height and Vtube location are determined reasonably, the output of a piezoelectric pump can get the best performance.
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