TY  - BOOK
AU  - Reinken,Henning
ED  - SpringerLink (Online service)
TI  - Controlling Mesoscale Turbulence: The Impact of Translational and Rotational Constraints on Pattern Formation in Microswimmer Suspensions 
T2  - Springer Theses, Recognizing Outstanding Ph.D. Research,
SN  - 9783031676369
AV  - TA418.9.A-Z 
PY  - 2024///
CY  - Cham
PB  - Springer Nature Switzerland, Imprint: Springer
KW  - Soft condensed matter
KW  - Colloids
KW  - Statistical Physics
KW  - System theory
KW  - Soft Materials
KW  - Complex Systems
KW  - Fluids
N1  - Introduction -- Theoretical Concepts -- Derivation of a Continuum Theory -- Unconstrained Mesoscale Turbulence -- Reorienting External Fields -- Obstacle Lattices,- Conclusions and Outlook -- Appendix
N2  - This thesis combines methods from statistical physics and nonlinear dynamics to advance research on the pattern formation in active fluids in several directions. In particular, it focuses on mesoscale turbulence, a state observed in microswimmer suspensions, which is characterized by the emergence of dynamic vortex patterns. The first major contribution concerns the bottom-up derivation of a frequently used continuum model of mesoscale turbulence from a set of particle-resolved stochastic equations. Utilizing the model, mesoscale turbulence is shown to induce nontrivial transport properties including a regime of optimal diffusion. The thesis then explores possible strategies of control. One of these relies on an external field that leads to stripe-like structures and can even suppress patterns entirely. The other involves geometric confinement realized by strategically placed obstacles that can reorganize the flow into a variety of ordered vortex structures. The turbulence transition inside an obstacle lattice is shown to have an intriguing analogy to an equilibrium transition in the Ising universality class. As a whole, this thesis provides important contributions to the understanding and control of turbulence in active fluids, as well as outlining exciting future directions, including applications. It includes a substantial introduction to the topic, which is suitable for newcomers to the field
UR  - https://doi.org/10.1007/978-3-031-67636-9
ER  -