用于超大规模模拟地下能源应用中断裂演化的多物理场耦合框架

David Trebotich, R. Settgast, Terry Ligocki, William Tobin, Gregory H. Miller, Sergi Molins, C. Steefel
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摘要

由于热、水文、化学和机械耦合过程发生在从微观孔隙尺度到现场尺度的广泛空间尺度上,预测断裂介质的演化具有挑战性。我们介绍了一种软件框架和科学工作流程,它将孔隙尺度流动和反应传输模拟器 Chombo-Crunch 与 GEOS 中的野外尺度地质力学求解器结合起来,模拟地下流体-岩石系统中的裂缝演化。这一新的多物理场耦合功能包含几个新功能。采用 HDF5 数据模式在两个代码之间进行断裂位置耦合,并利用 GEOS 力学求解器的粗分辨率限制耦合数据的大小,因此不会受到高分辨率孔隙尺度 Chombo-Crunch 求解器产生的数据的影响。耦合框架要求跟踪 GEOS 中粗节点前后的位置以及 Chombo-Crunch 中解析的嵌入边界。为此,我们开发了一种几何生成方法,可以跟踪两种不同方法之间的断裂界面。GEOS 的四边形网格被转换成三角形,这些三角形被组织成分仓和可访问的树形结构;然后使用连续符号距离函数将节点映射到 Chombo 表示法,该函数可确定断裂边界内部、断裂边界上和断裂边界外的位置。GEOS 位置保留在 Chombo-Crunch 耦合侧的内存中。流动、传输、反应和力学等多物理场耦合过程的时间步进节奏是稳定的,在时间上达到了实验时间尺度。通过对井筒-水泥和砂岩中碳酸盐水入侵导致的裂缝孔径演变的岩心水灾实验进行 9 天模拟时间的演示,验证了该方法的有效性。我们还在 OLCF Frontier 上模拟了验证问题的高分辨率版本,展示了超大规模计算资源的使用情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A multiphysics coupling framework for exascale simulation of fracture evolution in subsurface energy applications
Predicting the evolution of fractured media is challenging due to coupled thermal, hydrological, chemical and mechanical processes that occur over a broad range of spatial scales, from the microscopic pore scale to field scale. We present a software framework and scientific workflow that couples the pore scale flow and reactive transport simulator Chombo-Crunch with the field scale geomechanics solver in GEOS to simulate fracture evolution in subsurface fluid-rock systems. This new multiphysics coupling capability comprises several novel features. An HDF5 data schema for coupling fracture positions between the two codes is employed and leverages the coarse resolution of the GEOS mechanics solver which limits the size of data coupled, and is, thus, not taxed by data resulting from the high resolution pore scale Chombo-Crunch solver. The coupling framework requires tracking of both before and after coarse nodal positions in GEOS as well as the resolved embedded boundary in Chombo-Crunch. We accomplished this by developing an approach to geometry generation that tracks the fracture interface between the two different methodologies. The GEOS quadrilateral mesh is converted to triangles which are organized into bins and an accessible tree structure; the nodes are then mapped to the Chombo representation using a continuous signed distance function that determines locations inside, on and outside of the fracture boundary. The GEOS positions are retained in memory on the Chombo-Crunch side of the coupling. The time stepping cadence for coupled multiphysics processes of flow, transport, reactions and mechanics is stable and demonstrates temporal reach to experimental time scales. The approach is validated by demonstration of 9 days of simulated time of a core flood experiment with fracture aperture evolution due to invasion of carbonated brine in wellbore-cement and sandstone. We also demonstrate usage of exascale computing resources by simulating a high resolution version of the validation problem on OLCF Frontier.
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