AI 中文总结
该研究针对柔性板清扫颗粒床的惯性颗粒结构相互作用，引入无量纲数Sk揭示了清扫速度与颗粒喷射量的负相关关系，发现Sk≤1时大量喷射、Sk≥1时急剧减少的skim转变规律，为理解颗粒结构相互作用提供了关键无量纲参数。
AI 中文摘要
置于定常流中的柔性物体弯曲以减小阻力，这种自流线化是流固耦合（FSI）的特征。颗粒结构相互作用在自然界中同样普遍存在，但人们对其理解仍很有限。因此，我们研究惯性颗粒结构相互作用（IGSI），具体实验探究柔性板清扫颗粒床引发的颗粒喷射现象。研究发现，清扫速度越快，喷射量越少，柔性板的这一效应尤为明显。为理解该行为的物理机制，引入无量纲数Sk，其定义为板的弹性时间尺度与清扫时间尺度的比值。当Sk≤1时，板的挠曲遵循流固耦合（FSI）的自流线化规律，引发大量颗粒喷射；当Sk≥1时，板从床面 skim 而过，喷射颗粒的质量急剧减少。Sk将IGSI组织为FSI的颗粒对应物。
英文摘要
A flexible body placed in a steady flow bends to reduce drag. This self-streamlining is a hallmark of fluid-structure interaction (FSI). Granular-structure interaction is equally ubiquitous in nature. However, it remains poorly understood. Thus, we investigate inertial granular-structure interaction (IGSI). Specifically, ejection induced by a flexible plate sweeping a granular bed is experimentally examined. We find that a faster sweep results in less ejection, particularly for a flexible plate. To understand the underlying physics of this behavior, a dimensionless number Sk is introduced as the ratio of the plate elastic timescale to the sweep timescale. At $\mathrm{Sk} \lesssim 1$, the plate deflection follows the self-streamlining law of FSI and induces substantial ejection. At $\mathrm{Sk} \gtrsim 1$, on the other hand, the plate skims the bed and the mass of ejected grains decreases sharply. Sk organizes IGSI as the granular counterpart of FSI.
Comments8 pages, 9 figures
