In this work, we present an uncertainty quantification analysis to determine the influence and importance of some physical parameters in a reactive transport model in fractured porous media. An accurate description of flow and transport in the fractures is key to obtain reliable simulations, however, fractures geometry and physical characteristics pose several challenges from both the modeling and implementation side. We adopt a mixed-dimensional approximation, where fractures and their intersections are represented as objects of lower dimension. To simplify the presentation, we consider only two chemical species: one solute, transported by water, and one precipitate attached to the solid skeleton. A global sensitivity analysis to uncertain input data is performed exploiting the Polynomial Chaos expansion along with spectral projection methods on sparse grids.
翻译:在这项工作中,我们进行了不确定的量化分析,以确定一些物理参数在断裂多孔介质活性运输模型中的影响和重要性;准确描述断裂物的流量和迁移情况是获得可靠模拟的关键,然而,断裂几何和物理特征对模型和执行方面都构成若干挑战;我们采用了混合维近比,骨折及其交叉点作为较低维度的物体;为了简化表述方式,我们仅考虑两种化学种类:一种溶液,由水运来,一种附在固体骨骼上;对不确定的投入数据进行全球敏感性分析,利用多面混凝土扩张,同时在稀有的电网上采用光谱投影法。