EXPERIMENTAL VERSUS COMPUTATIONAL METHODS IN THE STUDY OF FLOW IN POROUS MEDIA
EXPERIMENTAL VERSUS COMPUTATIONAL METHODS IN THE STUDY OF FLOW IN POROUS MEDIA
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多孔介质流动研究中的实验方法与计算方法
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Wood
中科院分区：
文献类型：
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作者：
Vishal A. Patil;J. Finn;Xiaoliang He;R. Ziazi;S. Apte;J. Liburdy;B. Wood
由于多孔介质复杂的多相几何结构和在相当大的区域内分辨尺度的能力，应用于多孔介质流动研究的实验和计算方法都具有挑战性。本研究比较了实验获得的结果的基础上，折射率匹配的详细速度场矢量与使用DNS获得的一致性，以评估这两种方法。在随机填充床中使用均匀尺寸的球形颗粒获得数据。实验的挑战，包括折射率匹配误差，放大倍率的不确定性，并确定适当的几何形状，以及，艰巨性，匹配的几何形状，网格分辨率，特别是固体接触点附近，和适当的边界条件DNS。详细比较的数值模拟与PIV测量的速度的统计分布，并从DNS估计从测量值的偏差。除了某些收缩流区外，速度场的匹配是合理的。轴向速度结果在12%以内，法向速度在9%以内。流线细节表明，这两种方法一致。据发现，入口条件起着重要的作用，能够匹配的结果。命名法
Both experimental and computational methods applied to the study of porous media flows are challenging due to the complex multi-phase geometry and ability to resolve scales over a reasonably large domain. This study compares experimentally obtained results based on refractive index matching of detailed velocity field vectors with those obtained using DNS to evaluate both methods for consistency. Data were obtained in a randomly packed bed using uniformly sized spherical particles. Experimental challenges including refractive index matching errors, magnification uncertainties, and the identification of the proper geometry as well as, the arduousness, of matching the geometry, grid resolution particularly near solid contact points, and proper boundary conditions DNS are presented. Detailed comparison of the numerical simulation with PIV measurements are presented by attention paid to the statistical distribution of velocities, and their deviation from DNS estimations from the measured values. There is reasonable matching the velocity fields except for some regions of constricted flow. The axial velocity results are within 12 percent and the normal velocity within 9%. Streamline details show that both methods agree well. It is found that inlet conditions play a significant role in being able to match results. NOMENCLATURE