The current work reports the result of investigations into alternative representations of the temporal evolution of the laser powder bed fusion (LPBF) process. In order to provide the reader with sufficient context for the following discussion, the modeling challenge and its underlying cause, as well as current attempts to provide a satisfactory solution, will be discussed. Next, the author will describe two numerical methods (multirate time integration and parallel-in-time) to better represent the temporal scales of the problem. Finally, the results of applying these methods to a two-dimensional version of the heat transfer portion of the LPBF problem will be presented, reporting on both convergence and performance behavior, which indicate the possibility of significant speedup of solution calculations (40 to 100 times), along with well-characterized effects on solution accuracy.

当前的工作报告了调查结果的激光粉末床融合（LPBF）过程的时间演变的替代表示形式。为了为读者提供以下讨论的足够背景，将讨论建模挑战及其根本原因，以及当前试图提供令人满意的解决方案的尝试。接下来，作者将描述两种数值方法（多重速率时间积分和时间并行），以更好地表示问题的时间尺度。最后，将介绍将这些方法应用于LPBF问题的二维传热部分的结果，并报告收敛和性能行为，这表明可以显着加快求解速度（40到100倍） ），