论文标题
通过相互对流流动的异常扩散和传输
Anomalous diffusion and transport by a reciprocal convective flow
论文作者
论文摘要
在较低的number条件下，通常会分别考虑对流和扩散的动力学，因为它们的主要空间和时间尺度是不同的，但是对流和扩散的合作效应会导致扩散增强[Koyano等人。 Rev. E，102，033109（2020）]。在这项研究中，详细研究了这种合作效应。基于对流扩散方程的数值模拟表明，各向异性扩散和净移位以及扩散增强在相互流动下发生。这种异常的扩散和传输理论上是通过Langevin动力学的分析得出的。
Under low-Reynolds-number conditions, dynamics of convection and diffusion are usually considered separately because their dominant spatial and temporal scales are different, but cooperative effects of convection and diffusion can cause diffusion enhancement [Koyano et al., Phys. Rev. E, 102, 033109 (2020)]. In this study, such cooperative effects are investigated in detail. Numerical simulations based on the convection-diffusion equation revealed that anisotropic diffusion and net shift as well as diffusion enhancement occur under a reciprocal flow. Such anomalous diffusion and transport are theoretically derived by the analyses of the Langevin dynamics.
