Directed transport of active particles in a two-dimensional asymmetrical periodic channel with time-oscillating boundaries is numerically investigated. It is found that the oscillation of the channel boundaries and the self-propulsion of active particles are two different types of non-equilibrium driving that can induce directional transport, the competition between the both determine the direction of the transport. Remarkably, for a given asymmetric parameter of the channel, the average velocity can change direction twice on changing the oscillating frequency due to the competition of the oscillation of the channel boundaries and the self-propulsion. Additionally, we find that the particles with different self-propulsion velocities or rotational diffusion coefficients will move in opposite direction and can be separated.

数值研究了具有时间振荡边界的二维非对称周期性通道中活性颗粒的定向传输。发现通道边界的振荡和活性粒子的自推进是两种不同类型的非平衡驱动，它们可以引起定向传输，两者之间的竞争决定了传输的方向。明显地，对于给定的通道非对称参数，由于通道边界的振荡和自推进的竞争，平均速度在改变振荡频率时可以改变方向两次。此外，我们发现具有不同自推进速度或旋转扩散系数的粒子将沿相反方向移动并可以分离。