An effective three-marker drag model via sub-grid modeling for turbulent fluidization
An effective three-marker drag model via sub-grid modeling for turbulent fluidization
复制标题
通过子网格建模实现湍流流化的有效三标记阻力模型
DOI：
10.1016/j.ces.2018.08.026
复制
发表时间：
2018-12
影响因子：
4.7
通讯作者：
Zheng-Hong Luo
中科院分区：
文献类型：
--
作者：
Li-Tao Zhu;Yuan-Xing Liu;Zheng-Hong Luo
传统的均匀阻力模型采用粗网格时，没有考虑细尺度结构对水动力预报的影响。为了解决这个问题，本研究试图通过简单的子网格建模，这占了一个抛物线的空间浓度分布在一个计算网格内，开发一个有效的三标记阻力相关性。然后详细评估所开发的模型的可靠性和准确性。首次定量分析了均匀阻力输入对亚网格修正的影响。此外，对几种典型的亚网格模型和本文的工作进行了全面的比较。结果表明，我们的阻力修改的浓度梯度作为一个额外的标记系统的依赖性。粗网格流体动力学验证表明，开发的模型在各种操作条件下，在三维湍流流化床中产生一个相当好的协议与实验。此外，结果表明，本模型使用不同的均匀阻力输入仍然可以表现出令人满意的性能。该模型能够有效地解决反应器非均相流动问题，对工业反应器的设计和优化具有重要的应用价值。
The effect of meso-scale structures on hydrodynamic predictions is not considered in the classically uniform drag models when the coarse grid is used. To address this issue, this study tries to develop an effective three-marker drag correlation via straightforward sub-grid modeling, which accounts for a parabolic spatial concentration distribution within a computational grid. The reliability and accuracy of the developed model is then assessed in detail. How the uniform drag inputs affect the derived sub-grid correction is quantified for the first time. Besides, a comprehensive comparison between several typical sub-grid models and present work is implemented. Results reveal a systematic dependence of our drag modification on the concentration gradient as an additional marker. Coarse-grid hydrodynamic validation shows that the developed model yields a fairly improved agreement with experiments under various operating conditions in a 3D turbulent fluidized bed. Furthermore, results demonstrate that the present model using different uniform drag inputs still can exhibit satisfactory performance. The developed model is able to resolve the heterogeneous flow behavior both cheaply and adequately, which is potentially applied for industrial reactor design and optimization.
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