Environmental Transport of Gyrotactic Microorganisms in an Open?Channel Flow

The rich and complex phenomena of the transport active particles like microorganisms in shear flows are great significance to various biological environmental applications. Recent studies have shown that motility gyrotaxis algae could greatly influence their waters. However, little attention has been paid initial transient regime when classical Taylor dispersion model is not applicable. To tackle this problem, we resort Gill's generalized for passive solute, which potential accurately describing entire process. For first time, extend particles, effects swimming, gyrotaxis, flow on microorganism an open-channel thoroughly investigated. We theoretically solve drift coefficients, based obtain analytical solutions concentration distributions microorganisms, further validate these results by numerically solving governing equation. find there no flow, longitudinal can be weakened gravitactic accumulation vicinity water surface, while enhanced a stronger swimming ability microorganisms. effect does affect form asymptotic distribution, but enhance velocity dispersivity. analyze turbulence microorganisms' combing direct numerical simulation random walk simulation. increase decrease vertical non-uniformity as well relative contribution behavior both dispersivity during transport.