Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC10: Biofluids: Low Re Swimming IV
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 140B
Chair: Ranjiangshang Ran, University of Pennsylvania
Abstract: ZC10.00008 : Effects of Small Colony Formation on the Swimming and Feeding of Choanoflagellates*
2:21 PM–2:34 PM
Presenter:
Zachary J Moyer
(Trinity University)
Authors:
Zachary J Moyer
(Trinity University)
Hoa Nguyen
(Trinity University)
Ricardo Cortez
(Tulane University)
Lisa J Fauci
(Tulane University)
Mimi A Koehl
(University of California, Berkeley)
Collaborations:
Zachary Moyer, Hoa Nguyen, Ricardo Cortez, Lisa Fauci, Mimi Koehl
To study their feeding and swimming behaviors, we calculate the inward flux of fluid into the collar of each cell and the translational and rotational velocities of the colony due to the prescribed flagellar motions. We find that reducing the angle between cells in a small colony increases the average speed of the colony and the inward flux of each cell. For a two-cell colony, an increasing difference in their initial flagellar phases causes a linear increase in velocity and a difference in inward fluxes due to asymmetrical flow patterns. In general, the effect of the initial flagellar phase is only significant when all of the flagella beat on the same plane. Colonies are slower on average and have a smaller total flux per cell compared to a free-swimming cell. Since small colonies have similar work performance, they become less efficient as the number of cells increases.
*Funding Source: NSF DMS-2054259: Trinity - Tulane - Berkeley Collaboration (TTBC)
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