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首页> 外文期刊>Journal of Computational Physics >A solution algorithm for fluid-particle flows across all flow regimes
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A solution algorithm for fluid-particle flows across all flow regimes

机译：所有流动制度流体粒子流的解决方案算法

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摘要

Many fluid-particle flows occurring in nature and in technological applications exhibit large variations in the local particle volume fraction. For example, in circulating fluidized beds there are regions where the particles are close-packed as well as very dilute regions where particle-particle collisions are rare. Thus, in order to simulate such fluid-particle systems, it is necessary to design a flow solver that can accurately treat all flow regimes occurring simultaneously in the same flow domain. In this work, a solution algorithm is proposed for this purpose. The algorithm is based on splitting the free-transport flux solver dynamically and locally in the flow. In close-packed to moderately dense regions, a hydrodynamic solver is employed, while in dilute to very dilute regions a kinetic-based finite-volume solver is used in conjunction with quadrature-based moment methods. To illustrate the accuracy and robustness of the proposed solution algorithm, it is implemented in OpenFOAM for particle velocity moments up to second order, and applied to simulate gravity-driven, gas-particle flows exhibiting cluster-induced turbulence. By varying the average particle volume fraction in the flow domain, it is demonstrated that the flow solver can handle seamlessly all flow regimes present in fluid-particle flows. (C) 2017 Elsevier Inc. All rights reserved.
机译：自然界和技术应用中出现的许多流体颗粒流在局部颗粒体积分数上表现出很大的变化。例如，在循环流化床中，有颗粒密集的区域，也有颗粒碰撞很少的非常稀的区域。因此，为了模拟这种流体-颗粒系统，有必要设计一个能够准确处理同一流场中同时出现的所有流型的流动求解器。本文提出了一种求解算法。该算法基于在流中对自由输运通量求解器进行动态局部拆分。在密集到中等密度的区域，使用流体动力学解算器，而在稀释到非常稀释的区域，使用基于动力学的有限体积解算器与基于求积的矩量法相结合。为了说明所提出的求解算法的准确性和鲁棒性，在OpenFOAM中实现了高达二阶的颗粒速度矩，并将其应用于模拟重力驱动的、呈现团簇诱导湍流的气-颗粒流。通过改变流场中的平均颗粒体积分数，证明了流动求解器可以无缝处理流体颗粒流中存在的所有流动状态。（C） 2017爱思唯尔公司版权所有。

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