...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Dual-Permeability Modeling of Capillary Diversion and Drift Shadow Effects in Unsaturated Fractured Rock
【24h】

Dual-Permeability Modeling of Capillary Diversion and Drift Shadow Effects in Unsaturated Fractured Rock

机译：不饱和裂隙岩中毛细血管导流和漂移阴影效应的双渗透模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The drift-shadow effect describes capillary diversion of water flow around a drift or cavity in porous or fractured rock, resulting in lower water flux directly beneath the cavity. This paper presents computational simulations of drift-shadow experiments using dual-permeability models, similar to the models used for performance assessment analyses of flow and seepage in unsaturated fractured tuff at Yucca Mountain. Comparisons were made between the simulations and experimental data from small-scale drift-shadow tests. Results showed that the dual-permeability models captured the salient trends and behavior observed in the experiments, but constitutive relations (e.g., fracture capillary-pressure curves) can significantly affect the simulated results. Lower water flux beneath the drift was observed in both the simulations and tests, and fingerlike flow patterns were seen to exist with lower simulated capillary pressures. The dual-permeability models used in this analysis were capable of simulating these processes. However, features such as irregularities along the top of the drift (e.g., from roof collapse) and heterogeneities in the fracture network may reduce the impact of capillary diversion and drift shadow. An evaluation of different meshes showed that at the grid refinement used, a comparison between orthogonal and unstructured meshes did not result in large differences.
机译：漂移阴影效应描述了多孔或裂隙岩石中漂移或空腔周围水流的毛细管转移，导致空腔正下方的水通量降低。本文介绍了使用双重渗透率模型进行的阴影阴影实验的计算模拟，该模型类似于用于在丝兰山非饱和裂缝凝灰岩中进行渗流和渗流性能评估的模型。在模拟和小规模漂移阴影测试的实验数据之间进行了比较。结果表明，双渗透率模型捕获了在实验中观察到的显着趋势和行为，但本构关系（例如，断裂毛细管压力曲线）会显着影响模拟结果。在模拟和测试中均观察到漂移下方的水通量较低，并且在较低的模拟毛细管压力下，存在手指状的流态。此分析中使用的双渗透率模型能够模拟这些过程。然而，诸如沿漂移顶部的不规则性（例如，由于屋顶塌陷引起的不规则性）以及裂缝网络中的异质性等特征可减少毛细管改道和漂移阴影的影响。对不同网格的评估表明，在使用改进的网格时，正交和非结构化网格之间的比较不会导致较大的差异。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号