Fang, Lei
(2023)
Toward the two-way coupling of swimmer and surface gravity waves.
In: Pitt Momentum Fund 2023.
Abstract
Swimmers like protozoa and zooplankton are ubiquitous in lakes and oceans and the swimmers are in the surface gravity waves. There is a two-way coupling between swimmers and surface gravity waves. On the one hand, swimmers will be affected by the wave and form complex patterns (e.g., local accumulation), which can affect their forge and mate. Our previous study has shown that the shape and intrinsic swimming speed can affect swimmers' spatial distribution in flow. On the other hand, swimmers' peddling can generate local perturbations that have an unpredictable effect on the wave. In water waves, vorticity is zero, and Reynolds stress has the same effect as isotropic stress. The additional vorticity introduced by the swimmers will, by definition, generate a non-zero deviatoric part of Reynolds stress which produces fluctuation velocity from the mean flow. This mechanism could lead to strong biologically generated mixing. This preliminary study will help the PI to submit a proposal to the National Science Foundation Physical Oceanography program.
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