We numerically investigate the transport of a passive colloidal particle in a periodic array of planar counterrotating convection rolls,at high Peclet numbers.It is shown that an external bias,oriented parallel to the...We numerically investigate the transport of a passive colloidal particle in a periodic array of planar counterrotating convection rolls,at high Peclet numbers.It is shown that an external bias,oriented parallel to the array,produces a huge excess diffusion peak,in cases where bias and advection drag become comparable.This effect is not restricted to one-dimensional convection geometries,and occurs independently of the array’s boundary conditions.展开更多
Inspired by the problem of biofilm growth,we numerically investigate clustering in a two-dimensional suspension of active(Janus)particles of finite size confined in a circular cavity.Their dynamics is regulated by a n...Inspired by the problem of biofilm growth,we numerically investigate clustering in a two-dimensional suspension of active(Janus)particles of finite size confined in a circular cavity.Their dynamics is regulated by a non-reciprocal mechanism that causes them to switch from active to passive above a certain threshold of the perceived near-neighbor density(quorum sensing).A variety of cluster phases,i.e.,glassy,solid(hexatic)and liquid,are observed,depending on the particle dynamics at the boundary,the quorum sensing range,and the level of noise.展开更多
基金the National Natural Science Foundation of China(Grant Nos.11875201 and 11935010)supported by SERB Start-up Research Grant(Young Scientist)(Grant No.YSS/2014/000853)the UGC-BSR Start-up(Grant No.F.30-92/2015)。
文摘We numerically investigate the transport of a passive colloidal particle in a periodic array of planar counterrotating convection rolls,at high Peclet numbers.It is shown that an external bias,oriented parallel to the array,produces a huge excess diffusion peak,in cases where bias and advection drag become comparable.This effect is not restricted to one-dimensional convection geometries,and occurs independently of the array’s boundary conditions.
基金supported by the National Natural Science Foundation of China(Grant Nos.12375037 and 11935010)。
文摘Inspired by the problem of biofilm growth,we numerically investigate clustering in a two-dimensional suspension of active(Janus)particles of finite size confined in a circular cavity.Their dynamics is regulated by a non-reciprocal mechanism that causes them to switch from active to passive above a certain threshold of the perceived near-neighbor density(quorum sensing).A variety of cluster phases,i.e.,glassy,solid(hexatic)and liquid,are observed,depending on the particle dynamics at the boundary,the quorum sensing range,and the level of noise.
