A low-Reynolds-number actuator driven by instability: rotating or oscillating

Spontaneous oscillation of an active filament under viscosity gradients

“…Similar models have been employed by other studies on the behaviour of flexible structures in viscous fluids. 32,42–50…”

“…Similar models have been employed by other studies on the behaviour of flexible structures in viscous fluids. 32,[42][43][44][45][46][47][48][49][50] As shown in Fig. 5, this model comprises two beads numbered 1 and 2 sequentially connected to two links of length L/2.…”