CMG: Multiphase Porous Medium Dynamics: Pore to Field Scale

CMG：多相多孔介质动力学：孔隙到现场规模

• 批准号: 0327896
• 负责人: Cass Miller
• 金额: $ 66.2万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327896&HistoricalAwards=false
• 关键词: CMG; Multiphase; Porous; Medium; Dynamics

Multiphase porous medium systems occur routinely in natural and engineered systems. A motivating example class of problems for this work are porous medium systems comprised of natural materials, such as soils or aquifer materials that are occupied by multiple fluid phases. Models currently used to describe such systems do not follow naturally from pore scale representations, but rather are closed by empirical, ad hoc hysteretic relations that are intended to describe the interdependence among fluid pressures, saturations, and permeabilies. In this work, we will advance and evaluate a novel set of models based in rigorous multi-scale analysis. We will use multi-scale theory, simulation, and experiment to model phenomena associated with surface physics and chemistry that are buried in pressure-saturation relations or phenomenological aspects of current multiphase models. We will generalize standard models by the addition of interfacial contacts between solid, gas, and liquid phases. This generalization falls naturally into the class of models derived by Gray and Hassanizadeh. Closure relations represent a central piece of this work and will combine pore-scale numerical simulations, multi-scale averaging methods and analysis of scaling properties of coefficients and their consequences for macroscale model behavior, and experiments. The advanced models will be: solved with new numerical methods that generalize existing approaches, in particular new fast linear solvers with high-order accurate time-stepping algorithms; and analyzed mathematically for well-posedness with physically conceived initial-boundary conditions. Finally, we will benchmark the new models using experimental laboratory data.Multiphase subsurface flow problems present critical technological challenges to society. Current flow and transport models of porous medium systems have served vital roles in addressing the challenges, including remediation of contaminants, as well as recovery and protection of water resources. Nonetheless, advances in the fundamental models for flow and transport are needed, along with recognition and resolution of new numerical challenges associated with model developments. This work will advance the rigorous scientific and mathematical bases of such models and result in more realistic simulators for modeling transport phenomena in porous medium systems. We expect this work to lead to improved simulation of contaminant transport and recovery from groundwater systems.

多相多孔介质系统经常出现在自然和工程系统中。 一个激励的例子类的问题，这项工作是多孔介质系统的天然材料，如土壤或含水层材料，被多个流体相占据。 目前用于描述这种系统的模型并不自然地遵循孔隙尺度表示，而是封闭的经验，特设滞回关系，旨在描述流体压力，饱和度和渗透率之间的相互依赖性。 在这项工作中，我们将推进和评估一套新的模型，基于严格的多尺度分析。 我们将使用多尺度理论，模拟和实验来模拟与表面物理和化学相关的现象，这些现象隐藏在当前多相模型的压力-饱和关系或现象学方面。 我们将通过添加固相、气相和液相之间的界面接触来推广标准模型。 这一概括自然福尔斯格雷和哈桑扎德推导出的模型。闭合关系是这项工作的核心部分，它将结合联合收割机孔隙尺度数值模拟、多尺度平均方法和系数的标度特性分析及其对宏观尺度模型行为的影响以及实验。 先进的模式将是：解决了新的数值方法，推广现有的方法，特别是新的快速线性求解器与高阶精确的时间步进算法;和数学分析适定性与物理构思的初始边界条件。 最后，我们将使用实验室数据对新模型进行基准测试。多相地下流问题对社会提出了关键的技术挑战。 目前多孔介质系统的流动和输运模型在应对这些挑战方面发挥了重要作用，包括污染物的修复以及水资源的恢复和保护。 尽管如此，流动和运输的基本模型的进步是必要的，沿着的认识和解决与模型发展相关的新的数值挑战。 这项工作将推进严格的科学和数学基础，这种模型，并导致更现实的模拟器模拟多孔介质系统中的传输现象。 我们希望这项工作，以改善模拟污染物的运输和地下水系统的恢复。