Mesoscale-structure-based dynamic multiscale method for gas-solid flow
Mesoscale-structure-based dynamic multiscale method for gas-solid flow
复制标题
DOI：
10.1016/j.ces.2018.08.019
复制
发表时间：
2018-12
影响因子：
4.7
通讯作者：
Xizhong Chen;Junwu Wang
中科院分区：
文献类型：
--
作者：
Xizhong Chen;Junwu Wang
多尺度方法是近年来气固两相流数值模拟成功的基础。在我们之前的研究中（Chen和Wang，AIChE Journal，2017，63：3681-3691），已经提出了一种动态多尺度方法（DMM），用于在不同的模拟域中同时耦合不同的模拟模型，其中离散颗粒模型（DFM）用于近壁区域，其余的模拟域通过双流体模型（TFM）求解。在这项研究中，介观结构为基础的映射方法进一步提出并实现到DMM的框架。最近开发的基于EMMS的粒子速度分布函数（Wang等人，AIChE Journal，2016，62：2649-2657），其通过假设在计算网格中存在两相结构而导出，用于不同模型之间的映射。此外，EMMS模型的稳定性条件进行定位的过程中，新插入的粒子从TFM的边界映射到EMMS模型。将该模型应用于含B颗粒的提升管内的气固两相流动模拟，并与全TFM和全TFM的结果进行了比较，验证了该模型的正确性。
Multiscale methods have recently underpinned the successful simulation of gas-solid flow. In our prior study (Chen and Wang, AIChE Journal, 2017, 63: 3681–3691), a dynamic multiscale method (DMM) has been proposed to concurrently couple different simulation models in different simulation domains where discrete particle model (DPM) is used in the near wall regions and the rest of simulation domain is solved by two-fluid model (TFM). In this study, a mesoscale-structure-based mapping method was further proposed and implemented into the framework of DMM. The recently developed EMMS-based particle velocity distribution function (Wang et al., AIChE Journal, 2016, 62: 2649–2657), which was derived by assuming that there is a two-phase structure in a computational grid, was used for mapping between different models. In addition, the stability condition of the EMMS model was undertaken to locate the newly inserted particles during the boundary mapping process from the TFM to the DPM. The simulation results of gas-solid flow in a riser containing Geldart B particles using the proposed DMM have compared with those of using the full TFM and full DPM, which verifies its fidelities.