International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2021-12-01 , DOI: 10.1016/j.ijmecsci.2021.106946 Faroogh Garoosi 1 , Andrea Nicole Mellado-Cusicahua 1 , Maryam Shademani 1 , Ahmad Shakibaeinia 1, 2
Within the present work, the dam break flow over dry and wet beds are investigated experimentally, aiming to provide up-to-date data set and deeper insight into the morphology and hydrodynamics of the dam-break flood wave. The experiments are performed in a smooth prismatic channel with a rectangular cross-section. The wave profile and the downstream impact pressures are captured by a high-speed camera and several pressure sensors, respectively. The water depth is measured at five specified downstream locations through imaging processing. The laboratory observations are presented in terms of non-dimensional water level height, dynamic pressure variations on the impact wall, free-surface evolution, wave-front propagation, and high-resolution videos. Furthermore, two different numerical methods namely: (1) Volume-Of-Fluid (VOF) and (2) Moving Particle Semi Implicit (MPS) are also utilized to verify the repeatability of the experimental measurements. The comparisons show a satisfactory agreement between both models and the experiments. However, the results reveal that the Lagrangian model (MPS) slightly outperformed the standard VOF model in tracking highly deforming interfaces with severe topology changes. The dataset generated by small-scale laboratory investigations in the current work can provide a full panoramic view of dam-break flow which may be used as benchmark for validation of various CFD tools or understand the complex physics of dam-break wave and similar phenomena.
中文翻译:
干湿层溃坝流的实验和数值研究
在目前的工作中,对干湿层上的溃坝水流进行了实验研究,旨在提供最新的数据集并更深入地了解溃坝洪水波的形态和流体动力学。实验在具有矩形横截面的光滑棱柱形通道中进行。波形轮廓和下游冲击压力分别由高速摄像机和多个压力传感器捕获。通过成像处理在五个指定的下游位置测量水深。实验室观察以无量纲水位高度、冲击壁上的动态压力变化、自由表面演化、波前传播和高分辨率视频呈现。此外,两种不同的数值方法即:(1) 流体体积 (VOF) 和 (2) 运动粒子半隐式 (MPS) 也用于验证实验测量的可重复性。比较显示两种模型和实验之间的一致性令人满意。然而,结果表明,拉格朗日模型 (MPS) 在跟踪具有严重拓扑变化的高度变形界面方面略优于标准 VOF 模型。当前工作中小规模实验室调查生成的数据集可以提供溃坝流的完整全景图,可用作验证各种 CFD 工具的基准或了解溃坝波和类似现象的复杂物理。比较显示两种模型和实验之间的一致性令人满意。然而,结果表明,拉格朗日模型 (MPS) 在跟踪具有严重拓扑变化的高度变形界面方面略优于标准 VOF 模型。当前工作中小规模实验室调查生成的数据集可以提供溃坝流的完整全景图,可用作验证各种 CFD 工具的基准或了解溃坝波和类似现象的复杂物理。比较显示两种模型和实验之间的一致性令人满意。然而,结果表明,拉格朗日模型 (MPS) 在跟踪具有严重拓扑变化的高度变形界面方面略优于标准 VOF 模型。当前工作中小规模实验室调查生成的数据集可以提供溃坝流的完整全景图,可用作验证各种 CFD 工具的基准或了解溃坝波和类似现象的复杂物理。