颗粒流模拟的新进展
Recent advances in the simulation of particle-laden flows
摘要：
对于悬浮在流体中的运动颗粒的模拟，存在大量的算法。然而，找到解决特定物理问题的最佳方法通常是非常重要的，并且取决于颗粒和所涉及的流体的性质。在本报告中，我们提供了一些现有的模拟方法的简短概述，并提供了两个最先进的例子更详细。在这两种情况下，使用离散单元法（DEM）描述颗粒。DEM求解器通常与流体求解器耦合，流体求解器可以分为基于网格的或无网格的（每种都给出了一个例子）。流体解算器具有相对于粒子大小和分离的不同分辨率。首先，一个多组分格子玻尔兹曼算法（网格为基础，具有相当精细的分辨率），提出了研究粒子稳定的流体界面的行为，第二，光滑粒子流体动力学的实现（无网格，介观尺度分辨率，类似于颗粒大小）被引入，以突出该领域的一个新的球员，预计将特别适合于包括自由表面的流动。
英文摘要：
A substantial number of algorithms exists for the simulation of moving particles suspended in fluids. However, finding the best method to address a particular physical problem is often highly non-trivial and depends on the properties of the particles and the involved fluid(s) together. In this report we provide a short overview on a number of existing simulation methods and provide two state of the art examples in more detail. In both cases, the particles are described using a Discrete Element Method (DEM). The DEM solver is usually coupled to a fluid-solver, which can be classified as grid-based or mesh-free (one example for each is given). Fluid solvers feature different resolutions relative to the particle size and separation. First, a multicomponent lattice Boltzmann algorithm (mesh-based and with rather fine resolution) is presented to study the behavior of particle stabilized fluid interfaces and second, a Smoothed Particle Hydrodynamics implementation (mesh-free, meso-scale resolution, similar to the particle size) is introduced to highlight a new player in the field, which is expected to be particularly suited for flows including free surfaces.
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