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中文摘要：
本文将基于Front Tracking方法求解气液两相界面迁移特性的直接数值模拟方法扩展到中低Re数情形（1．89≤Re≤55．6），针对无边界以及垂直壁面附近高粘度流体中单个气泡（1．2mm≤D≤6mm）的上升过程进行模拟，研究气泡运动的机理以及气泡与壁面的相互作用。数值模拟准确再现了气泡的上升过程和变形，不同Re数下气泡的上升速度计算结果同经验关联式非常吻合，验证了该方法在中低Re数范围内的有效性。壁面附近流场的不对称引发壁面对气泡的升力是导致气泡逐渐偏离垂直壁面的原因，计算得到的壁面作用力系数同实验结果的对比也确定了本文参数范围内计算壁面对气泡作用力的模型。
英文摘要：
Direct numerical simulation based on the front tracking method to investigate the migration characteristics of gas-liquid two-phase flow is extended to low-to-moderate Reynolds number case （1.89≤ Re ≤55.6）. A single bubble rising in unbounded/wall-bounded high viscosity fluid is simulated in three dimensions to investigate the bubble motion mechanism and the bubble-wall interaction. The diameter of the bubble ranges from 1.2 mm to 6 mm. Deformed bubble shape and the rising process are reproduced under different Reynolds number. The calculated rising velocity agrees quite well with available empirical correlations, which validates the accuracy of this method in the low-tomoderate Reynolds number. The investigation of the velocity field around the bubble suggests that the suppression of the wall-normal velocity component is the source of the wall-induced lift force. The comparison of calculated wall-force coefficient with experiment determines the wall force model in the parameter range of present paper.
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