Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria
Numerical simulations were carried out modeling the bioconvection generated by chemotactic bacteria in a shallow chamber, and the influence of the Rayleigh number on bioconvection was examined. To confirm the present numerical accuracy, the numerical result was compared with a previous analytical so...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2009-07-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/4/3/4_3_536/_pdf/-char/en |
| _version_ | 1798020998559170560 |
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| author | Hideki YANAOKA Takao INAMURA Kaoru SUZUKI |
| author_facet | Hideki YANAOKA Takao INAMURA Kaoru SUZUKI |
| author_sort | Hideki YANAOKA |
| collection | DOAJ |
| description | Numerical simulations were carried out modeling the bioconvection generated by chemotactic bacteria in a shallow chamber, and the influence of the Rayleigh number on bioconvection was examined. To confirm the present numerical accuracy, the numerical result was compared with a previous analytical solution. The concentration distributions for a stationary flow field were in good agreement with the analytical solution. Next, the variation of flow and concentration fields with the Rayleigh number was examined. At small Rayleigh numbers, the bioconvection does not occur, and the bacterial cells collect near the free surface. The concentration distributions agree well with the analytical solution for the stationary fluid. At a critical Rayleigh number, bioconvection is formed in the center of the chamber. Since bioconvection increases with an increase in the Rayleigh number, a large difference between concentration distributions above the critical Rayleigh numbers and the analytical solution appears. The bacteria are active near the bottom wall in the chamber because adequate oxygen is supplied from the free surface. When bioconvection occurs, convective transport becomes dominant rather than the transport due to oxygen diffusion and bacterial swimming. |
| first_indexed | 2024-04-11T17:06:50Z |
| format | Article |
| id | doaj.art-3914764afba841669a2d7b030036ed5d |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-11T17:06:50Z |
| publishDate | 2009-07-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-3914764afba841669a2d7b030036ed5d2022-12-22T04:13:01ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582009-07-014353654510.1299/jfst.4.536jfstNumerical Analysis of Bioconvection Generated by Chemotactic BacteriaHideki YANAOKA0Takao INAMURA1Kaoru SUZUKI2Course of Intelligent Machines and System Engineering, Hirosaki UniversityCourse of Intelligent Machines and System Engineering, Hirosaki UniversityBrother Industries, Ltd.Numerical simulations were carried out modeling the bioconvection generated by chemotactic bacteria in a shallow chamber, and the influence of the Rayleigh number on bioconvection was examined. To confirm the present numerical accuracy, the numerical result was compared with a previous analytical solution. The concentration distributions for a stationary flow field were in good agreement with the analytical solution. Next, the variation of flow and concentration fields with the Rayleigh number was examined. At small Rayleigh numbers, the bioconvection does not occur, and the bacterial cells collect near the free surface. The concentration distributions agree well with the analytical solution for the stationary fluid. At a critical Rayleigh number, bioconvection is formed in the center of the chamber. Since bioconvection increases with an increase in the Rayleigh number, a large difference between concentration distributions above the critical Rayleigh numbers and the analytical solution appears. The bacteria are active near the bottom wall in the chamber because adequate oxygen is supplied from the free surface. When bioconvection occurs, convective transport becomes dominant rather than the transport due to oxygen diffusion and bacterial swimming.https://www.jstage.jst.go.jp/article/jfst/4/3/4_3_536/_pdf/-char/enbio-fluid mechanicsbioconvectionchemotaxisbacteriastabilitynumerical simulation |
| spellingShingle | Hideki YANAOKA Takao INAMURA Kaoru SUZUKI Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria Journal of Fluid Science and Technology bio-fluid mechanics bioconvection chemotaxis bacteria stability numerical simulation |
| title | Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria |
| title_full | Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria |
| title_fullStr | Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria |
| title_full_unstemmed | Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria |
| title_short | Numerical Analysis of Bioconvection Generated by Chemotactic Bacteria |
| title_sort | numerical analysis of bioconvection generated by chemotactic bacteria |
| topic | bio-fluid mechanics bioconvection chemotaxis bacteria stability numerical simulation |
| url | https://www.jstage.jst.go.jp/article/jfst/4/3/4_3_536/_pdf/-char/en |
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