Choanoﬂagellates are unicellular aquatic organisms with a single ﬂagellum that drives a feeding current through a funnel-shaped collar ﬁlter on which bacteria-sized prey are caught. Using computational ﬂuid dynamics (CFD) we model the beating ﬂagellum and the complex ﬁlter ﬂow of the choanoﬂagellate Diaphanoeca grandis. Our CFD simulations based on the current understanding of the morphology underestimate the experimentally observed clearance rate by more than an order of magnitude: The beating ﬂagellum is simply unable to draw enough water through the ﬁne ﬁlter. Our observations motivate us to suggest a radically diﬀerent ﬁltration mechanism that requires a ﬂagellar vane (sheet), and addition of a wide vane in our CFD model allows us to correctly predict the observed clearance rate.
|Number of pages||1|
|Publication status||Published - 2017|
|Event||70th Annual Meeting of the American Physical Society Division of Fluid Dynamics (DFD17) - Denver, United States|
Duration: 19 Nov 2017 → 21 Nov 2017
|Conference||70th Annual Meeting of the American Physical Society Division of Fluid Dynamics (DFD17)|
|Period||19/11/2017 → 21/11/2017|