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Download fileLattice-Boltzmann hydrodynamics of anisotropic active matter
journal contribution
posted on 07.12.2018, 15:12 authored by Joost de Graaf, Henri Menke, Arnold J.T.M. Mathijssen, Marc Fabritius, Christian Holm, Tyler ShendrukA plethora of active matter models exist that describe the behavior of self-propelled particles (or
swimmers), both with and without hydrodynamics. However, there are few studies that consider
shape-anisotropic swimmers and include hydrodynamic interactions. Here, we introduce a simple
method to simulate self-propelled colloids interacting hydrodynamically in a viscous medium using
the lattice-Boltzmann technique. Our model is based on raspberry-type viscous coupling and a
force/counter-force formalism, which ensures that the system is force free. We consider several
anisotropic shapes and characterize their hydrodynamic multipolar flow field. We demonstrate that
shape-anisotropy can lead to the presence of a strong quadrupole and octupole moments, in addition to
the principle dipole moment. The ability to simulate and characterize these higher-order moments will
prove crucial for understanding the behavior of model swimmers in confining geometries
Funding
J.d.G. acknowledges financial support by a NWO Rubicon Grant (No. #680501210). J.d.G. and C.H. thank the DFG Reuse of AIP Publishing content is subject to the terms: https://publishing.aip.org/authors/rights-and-permissions. Downloaded to IP: 163.1.246.64 On: Fri, 08 Apr 2016 08:46:55 134106-9 de Graaf et al. J. Chem. Phys. 144, 134106 (2016) for funding through the SPP 1726 “Microswimmers—From Single Particle Motion to Collective Behavior.” A.J.T.M.M. and T.N.S. acknowledge financial support from an ERC Advanced Grant MiCE (No. 291234). T.N.S. thanks EMBO for funding through (No. ALTF181-2013)
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