Effects of oblique irradiation on the onset of phototactic bioconvection

The linear stability of a suspension of phototactic algae is investigated numerically with particular emphasis on the effects of angle of incidence of the illuminating oblique collimated irradiation. The solutions show a transition of the most unstable mode from stationary to overstable state or vic...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-02, Vol.34 (2)
Main Authors: Panda, M. K., Sharma, Preeti, Kumar, Sandeep
Format: Article
Language:English
Subjects:
Fluid dynamics
Incidence angle
Irradiation
Mirrors
Parameters
Physics
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Summary:The linear stability of a suspension of phototactic algae is investigated numerically with particular emphasis on the effects of angle of incidence of the illuminating oblique collimated irradiation. The solutions show a transition of the most unstable mode from stationary to overstable state or vice versa for certain parameters at the variation in angle of incidence. Furthermore, a transition from mode 2 to mode 1 instability is observed at the variation of angle of incidence for some parameter values. Oscillatory instabilities are also frequently observed in the rigid upper surface case at the increment in angle of incidence.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0080449