TY - JOUR
T1 - Generic Long-Range Interactions between Passive Bodies in an Active Fluid
AU - Baek, Yongjoo
AU - Solon, Alexandre P.
AU - Xu, Xinpeng
AU - Nikola, Nikolai
AU - Kafri, Yariv
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/1/31
Y1 - 2018/1/31
N2 - A single nonspherical body placed in an active fluid generates currents via breaking of time-reversal symmetry. We show that, when two or more passive bodies are placed in an active fluid, these currents lead to long-range interactions. Using a multipole expansion, we characterize their leading-order behaviors in terms of single-body properties and show that they decay as a power law with the distance between the bodies, are anisotropic, and do not obey an action-reaction principle. The interactions lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned nonchiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tunable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.
AB - A single nonspherical body placed in an active fluid generates currents via breaking of time-reversal symmetry. We show that, when two or more passive bodies are placed in an active fluid, these currents lead to long-range interactions. Using a multipole expansion, we characterize their leading-order behaviors in terms of single-body properties and show that they decay as a power law with the distance between the bodies, are anisotropic, and do not obey an action-reaction principle. The interactions lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned nonchiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tunable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.
UR - http://www.scopus.com/inward/record.url?scp=85041354894&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.058002
DO - 10.1103/PhysRevLett.120.058002
M3 - 文章
C2 - 29481190
AN - SCOPUS:85041354894
SN - 0031-9007
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 058002
ER -