Fluid flows induced by a flagellated bacterial swimmer are often modeled as a simple force dipole, valid in the far field. Such representations neglect the inherent rotation of these bacteria as they swim, driven by a spinning helical flagellum or fascicle. Here, we present a refined swimmer representation that makes use of regularized singularities, retaining simplicity while capturing details of the complex flow field near the swimmer that have previously been absent from basic models. We illustrate the significance of this representation via a study of bacterial predator-prey dynamics, highlighting the importance of detailed hydrodynamics in models of bacterial interactions and bacterial active matter.

中文翻译：

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细菌流体动力学的正规化表示

由鞭毛细菌游泳者引起的流体流动通常被建模为在远场有效的简单力偶极子。这样的表示忽略了这些细菌在游动时由旋转的螺旋鞭毛或束驱动的固有旋转。在这里，我们提出了一种改进的游泳者表示形式，该形式利用正则化的奇异性，在捕获以前游泳者基本模型中不存在的游泳者附近复杂流场的细节的同时，保持了简单性。我们通过对细菌捕食者-猎物动力学的研究来说明这种表示的重要性，强调了在细菌相互作用和细菌活性物质模型中详细流体动力学的重要性。