利用流线投影的运算分裂技术用于高异质性和各向异性多孔介质中两相流
Operator splitting technique using streamline projection for two-phase flow in highly heterogeneous and anisotropic porous media
AI总结:
本文提出了一种快速的基于流线的数值方法,用于解决高产率注水场景中不可压缩流体在高异质性和各向异性多孔介质中的两相流方程。采用分数流公式,并使用间断伽辽金方法(DG)求解压力方程。在高产率注水场景中可以忽略毛细力效应。这允许我们提出一种改进的流线方法,结合一维前向追踪方法来求解传输方程。为了处理DG近似带来的高计算成本,应用了域分解方法,并结合代数多重网格预条件器来求解线性系统。在内部界面处需要特别注意,并且流线追踪器必须包含动态通信策略。该方法在各种二维和三维测试中得到验证,提供了与标准全隐式有限体积方法在流前传播近似方面的解决方案比较。
摘要:
在本文中,我们提出了一种快速的基于流线的数值方法,用于高产率注水场景中不可压缩流体在高异质性和各向异性多孔介质中的两相流方程。采用分数流公式,并使用间断伽辽金方法(DG)来求解压力方程。在高产率注水场景中可以忽略毛细力效应。这允许我们提出一种改进的流线方法,结合一维前向追踪方法来求解传输方程。为了处理DG近似带来的高计算成本,应用了域分解方法,并结合代数多重网格预条件器来求解线性系统。在内部界面处需要特别注意,并且流线追踪器必须包含动态通信策略。该方法在各种二维和三维测试中得到验证,提供了与标准全隐式有限体积方法在流前传播近似方面的解决方案比较。
英文摘要:
In this paper, we present a fast streamline-based numerical method for the two-phase flow equations in high-rate flooding scenarios for incompressible fluids in heterogeneous and anisotropic porous media. A fractional flow formulation is adopted and a discontinuous Galerkin method (DG) is employed to solve the pressure equation. Capillary effects can be neglected in high-rate flooding scenarios. This allows us to present an improved streamline approach in combination with the one-dimensional front tracking method to solve the transport equation. To handle the high computational costs of the DG approximation, domain decomposition is applied combined with an algebraic multigrid preconditioner to solve the linear system. Special care at the interior interfaces is required and the streamline tracer has to include a dynamic communication strategy. The method is validated in various two- and three-dimensional tests, where comparisons of the solutions in terms of approximation of flow front propagation with standard fully-implicit finite volume methods are provided.
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