Fig. 2
From: Pulsatile cerebral paraarterial flow by peristalsis, pressure and directional resistance
Orientation of cylinders to promote flow in the left to right direction. Left—cylinder orientation for zero flow. Middle—left to right flow flexes the cylinder so that it is oriented tangential to the flow. Right—right to left flow flexes the cylinder towards normal orientation. For simplicity, only one cylinder is shown, and it is attached to the wall, but in the solution in this section, cylinders are distributed throughout the channel. (From [17])