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@ARTICLE{Clopes:888931,
      author       = {Clopes, Judit and Gompper, Gerhard and Winkler, Roland G.},
      title        = {{H}ydrodynamic interactions in squirmer dumbbells: active
                      stress-induced alignment and locomotion},
      journal      = {Soft matter},
      volume       = {16},
      number       = {47},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2020-05330},
      pages        = {10676 - 10687},
      year         = {2020},
      abstract     = {Hydrodynamic interactions are fundamental for the dynamics
                      of swimming self-propelled particles. Specifically, bonds
                      between microswimmers enforce permanent spatial proximity
                      and, thus, enhance emergent correlations by
                      microswimmer-specific flow fields. We employ the squirmer
                      model to study the swimming behavior of microswimmer
                      dumbbells by mesoscale hydrodynamic simulations, where the
                      squirmers’ rotational motion is geometrically
                      unrestricted. An important aspect of the applied
                      particle-based simulation approach—the multiparticle
                      collision dynamics method—is the intrinsic account for
                      thermal fluctuations. We find a strong effect of active
                      stress on the motility of dumbbells. In particular, pairs of
                      strong pullers exhibit orders of magnitude smaller swimming
                      efficiency than pairs of pushers. This is a consequence of
                      the inherent thermal fluctuations in combination with the
                      strong coupling of the squirmers’ rotational motion, which
                      implies non-exponentially decaying auto- and
                      cross-correlation functions of the propulsion directions,
                      and active stress-dependent characteristic decay times. As a
                      consequence, specific stationary-state relative alignments
                      of the squirmer propulsion directions emerge, where pullers
                      are preferentially aligned in an antiparallel manner along
                      the bond vector, whereas pushers are preferentially aligned
                      normal to the bond vector with a relative angle of
                      approximately 60° at weak active stress, and one of the
                      propulsion directions is aligned with the bond at strong
                      active stress. The distinct differences between dumbbells
                      comprised of pusher or pullers suggest means to control
                      microswimmer assemblies for future microbot applications.},
      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          = {553 - Physical Basis of Diseases (POF3-553)},
      pid          = {G:(DE-HGF)POF3-553},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33089276},
      UT           = {WOS:000599748700009},
      doi          = {10.1039/D0SM01569E},
      url          = {https://juser.fz-juelich.de/record/888931},
}