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@ARTICLE{Clops:907775,
      author       = {Clopés, Judit and Gompper, Gerhard and Winkler, Roland G.},
      title        = {{A}lignment and propulsion of squirmer pusher–puller
                      dumbbells},
      journal      = {The journal of chemical physics},
      volume       = {156},
      number       = {19},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2022-02204},
      pages        = {194901},
      year         = {2022},
      abstract     = {The properties of microswimmer dumbbells composed of
                      pusher–puller pairs are investigated by mesoscale
                      hydrodynamic simulations employing the multiparticle
                      collision dynamics approach for the fluid. An individual
                      microswimmer is represented by a squirmer, and various
                      active-stress combinations in a dumbbell are considered. The
                      squirmers are connected by a bond, which does not impose any
                      geometrical restriction on the individual rotational motion.
                      Our simulations reveal a strong influence of the
                      squirmers’ flow fields on the orientation of their
                      propulsion directions, their fluctuations, and the swimming
                      behavior of a dumbbell. The properties of pusher–puller
                      pairs with an equal magnitude of the active stresses depend
                      only weakly on the stress magnitude. This is similar to
                      dumbbells of microswimmers without hydrodynamic
                      interactions. However, for non-equal stress magnitudes, the
                      active stress implies strong orientational correlations of
                      the swimmers’ propulsion directions with respect to each
                      other, as well as the bond vector. The orientational
                      coupling is most pro- nounced for pairs with large
                      differences in the active-stress magnitude. The alignment of
                      the squirmers’ propulsion directions with respect to each
                      other is preferentially orthogonal in dumbbells with a
                      strong pusher and weak puller, and antiparallel in the
                      opposite case when the puller dominates. These strong
                      correlations affect the active motion of dumbbells, which is
                      faster for strong pushers and slower for strong pullers.},
      cin          = {IAS-2 / IBI-5 / JARA-HPC / JARA-SOFT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-2-20090406 / I:(DE-Juel1)IBI-5-20200312 /
                      $I:(DE-82)080012_20140620$ / $I:(DE-82)080008_20150909$},
      pnm          = {5243 - Information Processing in Distributed Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5243},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {35597650},
      UT           = {WOS:000798560600010},
      doi          = {10.1063/5.0091067},
      url          = {https://juser.fz-juelich.de/record/907775},
}