Abstract The evolution of the volume fraction of solid phase, basal entrainment and interactions between the solid and fluid phase have significant impacts on rheological behavior, dynamic characteristics, and volume amplification in some earth-surface flows, including debris flows, hyper-concentration flows, dam-break flows. In this study, we propose a new two-phase flow dynamic model based on coupling of the depth-integrated continuum method and discrete element method (DEM). The fluid phase is computed by the depth-integrated continuum method, while the solid phase is modeled by the discrete element method. The data exchange between the two phases is efficiently handled by setting shared variables between the separate computational frameworks. The basal topography is simultaneously updated by numerically monitoring when solid particles are entrained into the fluid or deposited from the fluid. The current method provides a guiding solution for the common need to couple computations among multiple models. We examine several computational cases and compare the results with the theoretical solution and the experimental results. We conclude that the computational framework has unique advantages, placing it in a position to solve some ticklish issues in the field of fluid-solid interactions.

中文翻译：

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基于深度积分连续介质法和离散元法耦合的新型两相流模型

摘要 固相体积分数的演变、基础夹带和固液相相互作用对一些地表流的流变行为、动力学特性和体积放大具有重要影响，包括泥石流、超浓缩流、溃坝流。在这项研究中，我们提出了一种基于深度积分连续体方法和离散元方法 (DEM) 耦合的新两相流动力学模型。流体相采用深度积分连续介质法计算，而固相采用离散元法建模。通过在单独的计算框架之间设置共享变量，可以有效地处理两个阶段之间的数据交换。当固体颗粒被夹带入流体或从流体沉积时，通过数值监测同时更新基础地形。当前方法为在多个模型之间耦合计算的共同需求提供了指导性的解决方案。我们检查了几个计算案例，并将结果与​​理论解决方案和实验结果进行了比较。我们得出结论，该计算框架具有独特的优势，使其能够解决流固相互作用领域的一些棘手问题。