03865nam a22005775i 4500 978-3-031-67636-9 DE-He213 20251030113111.0 cr nn 008mamaa 240928s2024 sz | s |||| 0|eng d 9783031676369 978-3-031-67636-9 10.1007/978-3-031-67636-9 doi TA418.9.A-Z TGM bicssc TEC021000 bisacsh TGM thema Reinken, Henning. author. (orcid)0000-0001-8361-876X https://orcid.org/0000-0001-8361-876X aut http://id.loc.gov/vocabulary/relators/aut 85169 Controlling Mesoscale Turbulence [electronic resource] : The Impact of Translational and Rotational Constraints on Pattern Formation in Microswimmer Suspensions / by Henning Reinken. 1st ed. 2024. Cham : Springer Nature Switzerland : Imprint: Springer, 2024. XX, 221 p. 68 illus., 49 illus. in color. online resource. text txt rdacontent computer c rdamedia online resource cr rdacarrier text file PDF rda Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5061 Introduction -- Theoretical Concepts -- Derivation of a Continuum Theory -- Unconstrained Mesoscale Turbulence -- Reorienting External Fields -- Obstacle Lattices,- Conclusions and Outlook -- Appendix. 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. Soft condensed matter. 66723 Colloids. 85170 Statistical Physics. 70323 System theory. 66519 Soft Materials. 66725 Colloids. 85170 Statistical Physics. 70323 Complex Systems. 66520 Fluids. 67540 SpringerLink (Online service) Springer Nature eBook Printed edition: 9783031676352 Printed edition: 9783031676376 Printed edition: 9783031676383 Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5061 66370 https://doi.org/10.1007/978-3-031-67636-9 ZDB-2-PHA ZDB-2-SXP 63789 63789