A touch of non-linearity: mesoscale swimmers and active matter in fluids
Duration: 40 mins 41 secs
Share this media item:
Embed this media item:
Embed this media item:
About this item
Description: |
Klotsa, D
Wednesday 15th May 2019 - 09:40 to 10:20 |
---|
Created: | 2019-05-16 13:09 |
---|---|
Collection: | The mathematical design of new materials |
Publisher: | Isaac Newton Institute |
Copyright: | Klotsa, D |
Language: | eng (English) |
Distribution: | World (downloadable) |
Explicit content: | No |
Aspect Ratio: | 16:9 |
Screencast: | No |
Bumper: | UCS Default |
Trailer: | UCS Default |
Abstract: | Living matter, such as biological tissue, can be seen as a nonequilibrium hierarchical assembly of assemblies of smaller and smaller active components, where energy is consumed at many scales. The functionality and versatility of such living or “active-matter” systems render it a promising candidate in a discussion on the optimal design of soft matter. While many active-matter systems reside in fluids (solution, blood, ocean, air), so far, studies that include hydrodynamic interactions have focussed on microscopic scales in Stokes flows, where the active particles are <100μm and the Reynolds number, Re <<1. At those microscopic scales viscosity dominates and inertia can be neglected. However, what happens as swimmers slightly increase in size (say ~0.1mm-100cm) or as they form larger aggregates and swarms? The system then enters the intermediate Reynolds regime where both inertia and viscosity play a role, and where nonlinearities in the fluid are introduced. In this talk, I will present a simple model swimmer used to understand the transition from Stokes to intermediate Reynolds numbers, first for a single swimmer, then for pairwise interactions and finally for collective behavior. We show that, even for a simple model, inertia can induce hydrodynamic interactions that generate novel phase behavior, steady states and transitions.
|
---|
Available Formats
Format | Quality | Bitrate | Size | |||
---|---|---|---|---|---|---|
MPEG-4 Video | 640x360 | 1.94 Mbits/sec | 592.05 MB | View | Download | |
WebM | 640x360 | 827.82 kbits/sec | 246.77 MB | View | Download | |
iPod Video | 480x270 | 521.15 kbits/sec | 155.29 MB | View | Download | |
MP3 | 44100 Hz | 249.81 kbits/sec | 74.50 MB | Listen | Download | |
Auto * | (Allows browser to choose a format it supports) |