Accumulated spatters not only deteriorate the quality of the built parts in terms of surface roughness and/or density but also sabotage the whole fabrication process via damaging the powder re-coater. A cross-flow of inert gas inside the processing chamber is by far the only effective mean of removing the spouted spatters from the build platform. Despite the essential role, there are few efforts to investigate the interactions between the cross-flow dynamics and the spouted spatters, and hence, to optimize the design and settings of the cross-flow. Therefore, in this study, a coupled computational fluid dynamics (CFD) – discreate element method (DEM) simulation framework is proposed to study the interactions between the flow field and the spouted spatters during the single scan process. The simulation results for the maximum ejection distance and maximum ejection height of the spatters were shown to deviate from the numerical results reported in the literature by no more than 15%. Moreover, the simulation results for the distribution of the landing sites of the spatters were consistent with the experimental observations, which showed that a large number of large spatters landed near the scan track, while a small number of large spatters landed at a greater distance from the scan track. To the best of the authors’ knowledge, this study represents the first reported attempt to use a coupled CFD-DEM simulation framework to investigate the spatter dynamics within an LPBF chamber and to validate the results with experimental observations and published data. The proposed model is an important tool to optimize and calibrate the cross-flow inside the L-PBF processing chamber.

累积的飞溅物不仅会在表面粗糙度和/或密度方面降低构建部件的质量，而且还会通过损坏粉末重涂器来破坏整个制造过程。到目前为止，处理室内的惰性气体交叉流动是从构建平台上去除喷射飞溅的唯一有效手段。尽管具有重要作用，但很少有人努力研究横流动力学与喷射飞溅之间的相互作用，从而优化横流的设计和设置。因此，在本研究中，提出了耦合计算流体动力学 (CFD) - 离散元法 (DEM) 模拟框架来研究单次扫描过程中流场与喷射飞溅之间的相互作用。飞溅物的最大喷射距离和最大喷射高度的模拟结果与文献报道的数值结果的偏差不超过 15%。此外，对飞溅物着陆点分布的模拟结果与实验观察一致，表明大量大飞溅物落在扫描轨迹附近，而少量大飞溅物落在距离更远的地方。扫描轨道。据作者所知，这项研究是首次报道的尝试使用耦合 CFD-DEM 模拟框架来研究 LPBF 室内的飞溅动力学，并通过实验观察和已发布的数据验证结果。