Adhyapak, Tapan Chandra ; Stark, Holger (2016)
To initiate tumbling of an E. coli, one of the helical flagella reverses its sense of rotation. It then transforms from its normal form first to the transient semicoiled state and subsequently to the curly-I state. The dynamics of polymorphism is effectively modeled by describing flagellar elasticity through an extended Kirchhoff free energy. However, the complete landscape of the free energy r...Phase separation and coexistence of hydrodynamically interacting microswimmers
Blaschke, Johannes ; Maurer, Maurice ; Menon, Karthik ; Zöttl, Andreas ; Stark, Holger (2016)
A striking feature of the collective behavior of spherical microswimmers is that for sufficiently strong self-propulsion they phase-separate into a dense cluster coexisting with a low-density disordered surrounding. Extending our previous work, we use the squirmer as a model swimmer and the particle-based simulation method of multi-particle collision dynamics to explore the influence of hydrody...Taylor line swimming in microchannels and cubic lattices of obstacles
Münch, Jan L. ; Alizadehrad, Davod ; Babu, Sujin B. ; Stark, Holger (2016)
Microorganisms naturally move in microstructured fluids. Using the simulation method of multi-particle collision dynamics, we study in two dimensions an undulatory Taylor line swimming in a microchannel and in a cubic lattice of obstacles, which represent simple forms of a microstructured environment. In the microchannel the Taylor line swims at an acute angle along a channel wall with a clearl...