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@ARTICLE{Gtze:10018,
      author       = {Götze, I. and Gompper, G.},
      title        = {{M}esoscale {S}imulations of {H}ydrodynamic {S}quirmer
                      {I}nteractions},
      journal      = {Physical review / E},
      volume       = {82},
      number       = {4},
      issn         = {1539-3755},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-10018},
      pages        = {041921},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The swimming behavior of self-propelled microorganisms is
                      studied by particle-based mesoscale simulations. The
                      simulation technique includes both hydrodynamics and thermal
                      fluctuations that are both essential for the dynamics of
                      microswimmers. The swimmers are modeled as squirmers, i.e.,
                      spherical objects with a prescribed tangential surface
                      velocity, where the focus of thrust generation can be tuned
                      from pushers to pullers. For passive squirmers (colloids),
                      we show that the velocity autocorrelation function agrees
                      quantitatively with the Boussinesq approximation. Single
                      active squirmers show a persistent random-walk behavior,
                      determined by forward motion, lateral diffusion, and
                      orientational fluctuations, in agreement with theoretical
                      predictions. For pairs of squirmers, which are initially
                      swimming in parallel, we find an attraction for pushers and
                      a repulsion for pullers, as expected. The hydrodynamic force
                      between squirmer pairs is calculated as a function of the
                      center-to-center distances d(cm) and is found to be
                      consistent with a logarithmic distance dependence for d(cm)
                      less than about two sphere diameters; here, the force is
                      considerably stronger than expected from the far-field
                      expansion. The dependence of the force strength on the
                      asymmetry of the polar surface velocity is obtained. During
                      the collision process, thermal fluctuations turn out to be
                      very important and to strongly affect the postcollision
                      velocity directions of both squirmers.},
      keywords     = {J (WoSType)},
      cin          = {IAS-2 / IFF-2 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-2-20090406 / I:(DE-Juel1)VDB782 /
                      $I:(DE-82)080012_20140620$},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      shelfmark    = {Physics, Fluids $\&$ Plasmas / Physics, Mathematical},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000283491200003},
      doi          = {10.1103/PhysRevE.82.041921},
      url          = {https://juser.fz-juelich.de/record/10018},
}