Turbulence-induced clustering in compressible active fluids

Vasco M. Worlitzer; Gil Ariel; Avraham Be'er; Holger Stark; Markus Bär; Sebastian Heidenreich

doi:10.1039/d1sm01276b

Turbulence-induced clustering in compressible active fluids

Vasco M. Worlitzer, Gil Ariel, Avraham Be'er, Holger Stark, Markus Bär, Sebastian Heidenreich

Department of Mathematics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We study a novel phase of active polar fluids, which is characterized by the continuous creation and destruction of dense clusters due to self-sustained turbulence. This state arises due to the interplay between self-advection of the aligned swimmers and their defect topology. The typical cluster size is determined by the characteristic vortex size. Our results are obtained by investigating a continuum model of compressible polar active fluids, which incorporates typical experimental observations in bacterial suspensions, in particular a non-monotone dependence of speed on density.

Original language	English
Pages (from-to)	10447-10457
Number of pages	11
Journal	Soft Matter
Volume	17
Issue number	46
DOIs	https://doi.org/10.1039/d1sm01276b
State	Published - 14 Dec 2021

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

Funding

This work was supported by the Deutsche Forschungsge-meinschaft (DFG) through grants HE 5995/3-1 (SH, VMW and AB), BA 1222/7-1 (MB and GA) and SFB 910 (projects B4 (HS) and B5 (MB)). GA and AB are thankful for partial support from the Israel Science Foundation grant 373/16.

Funders	Funder number
Deutsche Forschungsgemeinschaft	HE 5995/3-1, BA 1222/7-1, SFB 910
Israel Science Foundation	373/16

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10.1039/d1sm01276b

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title = "Turbulence-induced clustering in compressible active fluids",

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AU - Worlitzer, Vasco M.

AU - Ariel, Gil

AU - Be'er, Avraham

AU - Stark, Holger

AU - Bär, Markus

AU - Heidenreich, Sebastian

PY - 2021/12/14

Y1 - 2021/12/14

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AB - We study a novel phase of active polar fluids, which is characterized by the continuous creation and destruction of dense clusters due to self-sustained turbulence. This state arises due to the interplay between self-advection of the aligned swimmers and their defect topology. The typical cluster size is determined by the characteristic vortex size. Our results are obtained by investigating a continuum model of compressible polar active fluids, which incorporates typical experimental observations in bacterial suspensions, in particular a non-monotone dependence of speed on density.

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Turbulence-induced clustering in compressible active fluids

Abstract

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