Euler-Euler multiphase CFD-simulation with full Reynolds stress model and anisotropic bubble-induced turbulence
Euler-Euler multiphase CFD-simulation with full Reynolds stress model and anisotropic bubble-induced turbulence
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DOI：
10.1016/j.ijmultiphaseflow.2017.10.012
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发表时间：
2018-02-01
影响因子：
3.8
通讯作者：
Rzehak, Roland
中科院分区：
文献类型：
--
作者：
Parekh, Jigar;Rzehak, Roland
在目前的工作中，Euler-Euler模型的泡状流相结合的完整的雷诺应力模型的湍流在液体载体相。雷诺应力模型很少在这方面进行了探讨，虽然需要这种水平的描述的影响，经常遇到的欧拉-欧拉方法是面向工业应用。特别是，源项描述了额外的气泡引起的贡献，以适当的帐户，其各向异性的液相湍流尚未牢固地建立。这里给出了基于气泡相对于液体的运动方向的公式。由于Launder，Reece和Rodi和Speziale，Sarkar和Gatski的雷诺应力模型的两个著名的变种进行了比较。封闭的气泡力的关系，已被证明以前的工作以及在一系列的条件。通过与一组包含液体和气体流量变化以及不同管径的管流数据的比较，验证了该模型。选择数据的一个重要标准是提供雷诺应力张量各个分量的测量值。(C)2017爱思唯尔有限公司版权所有
In the present work, Euler-Euler modeling of bubbly flows is combined with a full Reynolds stress model for the turbulence in the liquid carrier phase. Reynolds stress models have only rarely been explored in this context, although effects requiring this level of description are frequently encountered in industrial applications towards which the Euler-Euler approach is geared. In particular, source terms describing the additional bubble-induced contribution to the liquid phase turbulence with proper account for its anisotropy have not firmly been established yet. A formulation based on the direction of bubble motion relative to the liquid is given here. Two well-known variants of Reynolds stress models due to Launder, Reece and Rodi and Speziale, Sarkar and Gatski are compared. Closure relations for the bubble forces are applied that have been shown previously to work well over a range of conditions. The model is validated by comparison with a set of pipe flow data that contains variations of liquid and gas flow rates as well as different pipe diameters. An important criterion for the selection of the data was to provide measurements of individual components of the Reynolds stress tensor. (C) 2017 Elsevier Ltd. All rights reserved.