分层流体中游动体（squirmers）引起的混合
Mixing by squirmers in stratified fluids
AI总结：
本研究通过球形游动体模型量化分层流体中微小游泳者的混合效率，发现近场混合与以往一致，总体混合大于点状游泳者但仍弱；小尺寸游泳者难以显著混合，但提出了若干可促进海洋混合的新途径。
摘要：
我们研究了在密度分层流体中，一个微小的游泳生物体所引起的混合。我们将该游泳者建模为一个球形游动体（squirmer），并通过混合效率来量化混合程度，混合效率定义为流体势能变化率与游泳者所做总功之比。我们分别评估了游泳者近场和远场的混合情况，发现近场混合与以往研究结果一致，但总体混合远大于由点状游泳者（如力偶极子）引起的混合，尽管在弱分层情况下仍然较小。对于非相互作用的均匀稀悬浮液中的游泳者，也得到了类似的结果。我们的研究强调了游泳者大小对混合的影响，揭示了小尺寸游泳者无法引起显著的混合。然而，我们提出了少数（尚未探索的）途径，通过这些途径，小游泳者可以引起显著的混合，最终对海洋混合做出贡献。
英文摘要：
We find the mixing induced by a small swimming organism in a density stratified fluid. We model the swimmer as a spherical squirmer and quantify mixing through a mixing efficiency that is the ratio of rate of change of potential energy of fluid to the total work done by the swimmer. Assessing mixing in the near field and far field of the swimmer separately, we find that the near-field mixing aligns with past work, but the overall mixing is much larger than that caused by a point-sized swimmer (like force-dipole), although still small in weak stratification. Equivalent results are also obtained for a homogeneous dilute suspension of non-interacting swimmers. Our study highlights the impact of swimmer size on mixing, revealing that small-sized swimmers cannot induce substantial mixing. However, we propose few (unexplored) pathways through which small swimmers could induce significant mixing, ultimately contributing towards oceanic mixing.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
