Smooth particle hydrodynamics simulations of low Reynolds number flows through porous media     

David W. Holmes  Peter Tilke 《国际地质力学数值与分析法杂志》2011,35(4):419-437

In this paper, a three‐dimensional smooth particle hydrodynamics (SPH) simulator for modeling grain scale fluid flow in porous media is presented. The versatility of the SPH method has driven its use in increasingly complex areas of flow analysis, including the characterization of flow through permeable rock for both groundwater and petroleum reservoir research. SPH provides the means to model complex multi‐phase flows through such media; however, acceptance of the methodology has been hampered by the apparent lack of actual verification within the literature, particulary in the three‐dimensional case. In this paper, the accuracy of SPH is addressed via a comparison to the previously recognized benchmarks of authors such as Sangani and Acrivos (Int. J. Multiphase Flow 1982; 8 (4): 343–360), Zick and Homsy (J. Fluid Mech. 1982; 115 :13–26) and Larson and Higdon (Phys. Fluids A 1989; 1 (1):38–46) for the well‐defined classical problems of flow through idealized two‐ and three‐dimensional porous media. The accuracy of results for such low Reynolds number flows is highly dependent on the implementation of no‐slip boundary conditions. A new, robust and numerically efficient, method for implementing such boundaries in SPH is presented. Simulation results for friction coefficient and permeability are shown to agree well with the available benchmarks. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

深源花岗岩中的碳氢化合物   总被引：2，自引：0，他引：2  

曾贻善  刘家齐 《地球化学》2001,30(5):445-449

利用石油地球化学的溶剂抽提和气相色谱技术研究了北京延庆碓臼峪花岗岩（深源花岗岩）样品中的可溶有机质，同时用高温处理过的石英砂进行空白对比实验。结果表明，所研究的两个花岗岩样品中均存在少量的高碳数碳氢化合物，且具有相同的成分特征。这为自然界存在深源的长链碳氢化合物提供了新的证据，也为解释花岗岩浆演化晚期水热流体中短链羧酸的成因提供了线索。  相似文献   

VTI介质中的地层弹性参数反演     

杜丽英  杜丽娟  彭苏萍  王永丰 《世界地质》2001,20(4):396-401,416

在VTI介质中，用非双曲线可以很好地近似P－P波中长排列情况下的旅行时；而对P－SV波来说，应用非双曲线却不能很好地近似P－SV波的施行时。对P－P波、P－SV波的旅行时进行三项泰勒展开时，它们的系数却包含了地震波的各向异性信息及其垂直速度信息，这为地震波的弹性参数反演提供了基础。实验分析表明，在中等排列长度下可以精确地得到了P－P波，P－SV波旅行时的三项泰勒展式系数，从而可以精确地进行地层弹性参数反演。  相似文献   

多光谱浅海水深提取方法研究   总被引：4，自引：0，他引：4  

党福星  丁谦 《国土资源遥感》2001,12(4):53-58

利用我国南海某岛礁的TM数据和实测水深资料,试验性地研究了一种在不同底质反射条件下多光谱定量提取水深信息的方法,计算了浅海岛礁水深,取得了较好的应用效果和较高的测深精度.  相似文献   

Selective dissolution of magnetic iron oxides in the acid–ammonium oxalate/ferrous iron extraction method—I. Synthetic samples     

Ingeborg H. M. van Oorschot  Mark J. Dekkers 《Geophysical Journal International》2001,145(3):740-748

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Two‐dimensional velocity macro model estimation from seismic reflection data by local differential semblance optimization: applications to synthetic and real data sets     

H. Chauris  M. Noble 《Geophysical Journal International》2001,144(1):14-26

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A seismogram digitization and database management system     

刘政凯  王炜  张荣  俞能海  张天中  潘坚云 《地震学报(英文版)》2001,14(3):333-341

IntroductionSeismograms contain seismic wave data recorded by instruments. They are the main information source for seismological studies. Now we are developing seismological stations with digital records, which can offer seismic wave data with better quality than before. But the paper analog seismograms accumulated in the past decades still have great room for application. They are important original data for studying earthquakes. Lots of valuable information are contained in them. Due to a…  相似文献   

细胞自动机在地震波传播研究中的应用   总被引：8，自引：5，他引：8       下载免费PDF全文

李幼铭  胡健行 《地球物理学报》1995,38(5):651-661

本文基于细胞自动机在地震波传播研究中的最近成果，阐述了其基本的研究思路与理论框架，给出了一个计算实例．在此基础上就细胞自动机方法与传统波动方程的衔接关系及复杂介质中地震波正反问题作了讨论，并对研究前景进行展望．  相似文献   

Generation of three dimensional flow fields for statistically anisotropic heterogeneous porous media     

M. A. Cushy  A. Bellin  Y. Rubin 《Stochastic Environmental Research and Risk Assessment (SERRA)》1995,9(1):89-104

A methodology for generating three dimensional (3D) flow fields for statistically anisotropic heterogeneous porous media is presented and demonstrated. The simulated flow fields are shown to exhibit the input spatial correlation structure and observe mass continuity. Sample flow fields are presented in the form of cross sectional slices of the 3D formation. These cross sections demonstrate visually the characteristics of subsurface flow. The method was found to be faster than traditional techniques in terms of its computational requirements. Given this method, it is possible to generate the large number of realizations of a velocity field necessary to compute high order statistics in transport problems.  相似文献   

航空影像分割的Snake方法     

刘少创  林宗坚 《武汉大学学报(信息科学版)》1995,(1)

在介绍了Ｓｎａｋｅ模型以后，将这种方法引入航空影像的分割过程。为了对Ｓｎａｋｅ方法的分割能力进行验证，给出了一些实例。  相似文献