Study on bubble-induced turbulence in pipes and containers with Reynolds-stress models
Study on bubble-induced turbulence in pipes and containers with Reynolds-stress models
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DOI：
10.1007/s42757-021-0128-0
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Y. Liao;T. Ma
中科院分区：
文献类型：
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作者：
Y. Liao;T. Ma
泡状流仍然是大规模数值模拟的一个挑战。尽管人们一直在努力，但对气泡诱导湍流（BIT）的认识和模拟还远未达到令人满意的程度。特别是，气泡的浮力通常会在流动中引入湍流各向异性，这不能通过具有代表BIT的特定源项的标准涡动粘度模型来捕获。最近，基于气泡分辨直接数值模拟数据，Ma等人在Euler-Euler框架内开发了一种新的考虑BIT的湍流应力模型（J Fluid Mech，883：A9（2020））。目前的工作的目的是评估这个模型，并比较其性能与其他标准的螺栓应力模型使用系统的测试策略。我们选择的BIT占主导地位的范围内的实验数据，发现新的模型导致重大改进，在预测的全压应力分量。
Bubbly flow still represents a challenge for large-scale numerical simulation. Among many others, the understanding and modelling of bubble-induced turbulence (BIT) are far from being satisfactory even though continuous efforts have been made. In particular, the buoyancy of the bubbles generally introduces turbulence anisotropy in the flow, which cannot be captured by the standard eddy viscosity models with specific source terms representing BIT. Recently, on the basis of bubble-resolving direct numerical simulation data, a new Reynolds-stress model considering BIT was developed by Ma et al. (J Fluid Mech, 883: A9 (2020)) within the Euler—Euler framework. The objective of the present work is to assess this model and compare its performance with other standard Reynolds-stress models using a systematic test strategy. We select the experimental data in the BIT-dominated range and find that the new model leads to major improvements in the prediction of full Reynolds-stress components.