Flow transitions and length scales of a channel-confined active nematic
We perform lattice Boltzmann simulations of an active nematic fluid confined in a two-dimensional channel to study the range of flow states that are stabilised by the confinement: unidirectional flow, oscillatory flow, the dancing state, localised active turbulence and fully-developed active turbule...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Royal Society of Chemistry
2021
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| _version_ | 1826308859685240832 |
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| author | Samui, A Yeomans, JM Thampi, SP |
| author_facet | Samui, A Yeomans, JM Thampi, SP |
| author_sort | Samui, A |
| collection | OXFORD |
| description | We perform lattice Boltzmann simulations of an active nematic fluid confined in a two-dimensional channel to study the range of flow states that are stabilised by the confinement: unidirectional flow, oscillatory flow, the dancing state, localised active turbulence and fully-developed active turbulence. We analyse the flows in Fourier space, and measure a range of different length scales which describe the flows. We argue that the different states occur as a result of flow instabilities inherent to the system. As a consequence the characteristic length scale for oscillatory flow, the dancing state and localised active turbulence is set by the channel width. Fully-developed active turbulence occurs only when the channel width is larger than the intrinsic, active length scale of the bulk fluid. The results clarify why the activity number is a control parameter for the flow transitions. |
| first_indexed | 2024-03-07T07:25:35Z |
| format | Journal article |
| id | oxford-uuid:4ebe094a-617c-4645-94ec-c92296e6b748 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:25:35Z |
| publishDate | 2021 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | oxford-uuid:4ebe094a-617c-4645-94ec-c92296e6b7482022-11-17T10:24:48ZFlow transitions and length scales of a channel-confined active nematicJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4ebe094a-617c-4645-94ec-c92296e6b748EnglishSymplectic ElementsRoyal Society of Chemistry2021Samui, AYeomans, JMThampi, SPWe perform lattice Boltzmann simulations of an active nematic fluid confined in a two-dimensional channel to study the range of flow states that are stabilised by the confinement: unidirectional flow, oscillatory flow, the dancing state, localised active turbulence and fully-developed active turbulence. We analyse the flows in Fourier space, and measure a range of different length scales which describe the flows. We argue that the different states occur as a result of flow instabilities inherent to the system. As a consequence the characteristic length scale for oscillatory flow, the dancing state and localised active turbulence is set by the channel width. Fully-developed active turbulence occurs only when the channel width is larger than the intrinsic, active length scale of the bulk fluid. The results clarify why the activity number is a control parameter for the flow transitions. |
| spellingShingle | Samui, A Yeomans, JM Thampi, SP Flow transitions and length scales of a channel-confined active nematic |
| title | Flow transitions and length scales of a channel-confined active nematic |
| title_full | Flow transitions and length scales of a channel-confined active nematic |
| title_fullStr | Flow transitions and length scales of a channel-confined active nematic |
| title_full_unstemmed | Flow transitions and length scales of a channel-confined active nematic |
| title_short | Flow transitions and length scales of a channel-confined active nematic |
| title_sort | flow transitions and length scales of a channel confined active nematic |
| work_keys_str_mv | AT samuia flowtransitionsandlengthscalesofachannelconfinedactivenematic AT yeomansjm flowtransitionsandlengthscalesofachannelconfinedactivenematic AT thampisp flowtransitionsandlengthscalesofachannelconfinedactivenematic |