AI 中文总结
本研究通过高保真数值模拟含拓扑变化气泡的垂直通道流，探究表面张力对湍流各向异性的影响，发现除通道中心外多相流比单相流更具各向同性，源于扫掠事件增强的能量再分配。
AI 中文摘要
针对含气泡的向上垂直通道流开展了高保真数值模拟，其中气泡会发生拓扑变化（破碎与合并），旨在探究表面张力对载体相湍流各向异性的影响。定性分析显示，大气泡尾迹区的速度波动会增强；此外，速度谱表明，这些结构似乎与气泡尺寸成比例，并与靠近壁面的结构相互作用。最后，重心图及其他湍流各向异性指标表明，除了通道中心（存在最大气泡的区域）外，在相同摩擦雷诺数下，多相流案例实际上比单相流更具各向同性。这种意外行为归因于大气泡存在时，扫掠事件（高速流体向壁面运动）的增强实现了更优的能量再分配。
英文摘要
High-fidelity numerical simulations of bubble-laden, vertical channel flow in the upward configuration, where the bubbles undergo topological changes (breakup and coalescence), were performed with the purpose of exploring the effect of the surface tension on the turbulence anisotropy in the carrier phase. A qualitative analysis shows that velocity fluctuations are enhanced in the wake of large bubbles. Moreover, as shown by the velocity spectra, these structures seem to scale with bubble size and interact with those closer to the wall. Finally, a barycentric map and other indicators of turbulence anisotropy clarify that, except at the core of the channel where the largest bubbles reside, the multiphase flow cases are actually more isotropic than the single-phase flow at a matching friction Reynolds number. This unexpected behavior is attributed to a better redistribution of energy due to an enhancement of sweep events (high-speed fluid towards the wall) in the presence of large bubbles.
Comments6 pages, 5 figures. To appear in the Proceedings of the 14th International Symposium on Turbulence and Shear Flow Phenomena (TSFP14), Heidelberg, Germany, July 28-31, 2026
