Bio-particulate matter includes grains, cereal crops, and biomass that are considered discrete materials with irregular size and shape. Although the flow of these particles can behave like a continuum fluid at times, their discontinuous behavior cannot be simulated with traditional continuum-based modeling. The Discrete Element Method (DEM), coupled with Computational Fluid Dynamics (CFD), is considered a promising numerical method that can model discrete particles by tracking the motion of each particle in fluid flow. DEM has been extensively used in the field of engineering, where its application is starting to achieve the popularity in agricultural processing. While CFD has been able to simulate the complex fluid flows with a quantitative and qualitative description of the temporal and spatial change of the flow field. This paper reviews the recent strategies and the existing applications of the CFD–DEM coupling approach in aerodynamic systems of bio-particles. It mainly represents four principal aspects: the definition of aerodynamic systems with its principals, modeling of particle motion including interaction forces of particle–particle and particle–fluid in the system, CFD–DEM coupling methodologies, and drag correlation models with theoretical developments, and the applications of aerodynamic systems related to the agricultural field. The existing published literature indicates that CFD–DEM is a promising approach to study the bio-particulate matter behavior immersed in fluid flow, and it could be benefiting from developing and optimizing the device's geometry and the operations. The main findings are discussed and summarized as a part of the review, where future developments and challenges are highlighted.

生物微粒物质包括谷物，谷类作物和生物质，它们被认为是具有不规则大小和形状的离散材料。尽管这些粒子的流动有时会像连续流体一样，但它们的不连续行为无法用传统的基于连续体的模型进行模拟。离散元方法（DEM）与计算流体动力学（CFD）结合被认为是一种很有前途的数值方法，该方法可以通过跟踪流体中每个粒子的运动来对离散粒子建模。DEM已广泛应用于工程领域，在工程领域中，其应用已开始在农业加工中获得普及。尽管CFD能够通过定量和定性描述流场的时空变化来模拟复杂的流体流动。本文回顾了CFD-DEM耦合方法在生物粒子空气动力学系统中的最新策略和现有应用。它主要代表四个主要方面：空气动力学系统的定义及其原理，粒子运动的建模（包括系统中粒子-粒子和粒子-流体的相互作用力），CFD-DEM耦合方法以及具有理论发展的阻力相关模型，以及气动系统在农业领域的应用。现有的公开文献表明，CFD-DEM是研究浸入流体流中的生物微粒行为的一种有前途的方法，它可能会受益于开发和优化设备的几何形状和操作。作为审查的一部分，对主要发现进行了讨论和总结，