Abstract The presence of bubbles dramatically changes the liquid turbulence in bubbly flows. Modifications to liquid turbulent transport equations by adding source terms representing the effect of bubble-induced turbulence (BIT) are usually made to promote the reliability of Computational Fluid Dynamics simulations. However, existing closures for BIT fail to give reliable predictions of both mean flow properties and turbulence kinetic energy. In this work, a new BIT model, which embeds both the bubble swarm effects and the physics of bubble-induced vortices, is proposed to modify the Reynold stress model for bubbly flows. The anisotropy nature of BIT is also considered. The new BIT model can predict both mean flows and turbulence kinetic energy in airlift column systems, while investigated existing BIT models from the literature fail. Three simulation test cases for pipes and one for a bubble column have been conducted to show the validity of the proposed BIT model.

中文翻译：

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气升塔、管道和气泡塔中气液气泡流动的气泡诱导湍流模型

摘要 气泡的存在极大地改变了气泡流中的液体湍流。通常通过添加表示气泡诱导湍流 (BIT) 影响的源项来修改液体湍流传输方程，以提高计算流体动力学模拟的可靠性。然而，现有的 BIT 闭包无法对平均流动特性和湍流动能做出可靠的预测。在这项工作中，提出了一种新的 BIT 模型，该模型嵌入了气泡群效应和气泡引起的涡流物理学，用于修改气泡流的雷诺应力模型。还考虑了 BIT 的各向异性性质。新的 BIT 模型可以预测气升柱系统中的平均流量和湍流动能，而研究文献中现有的 BIT 模型失败。