在岩土工程领域, 许多应用都涉及到多尺度和多物理场, 例如内部侵蚀、水力压裂、能源桩、城市垃圾处理、非常规油气藏的生产、天然气水合物的热激法和降压法开采、路面的冻融循环、放射性废物处理、污染物运移和二氧化碳封存等等。在文献中, 这些多物理场通常可能包括以下两个或者两个以上方面: 固体变形、流体流动扩散、热传导和热对流、化学/生物反应、电场等等。此外, 所研究的空间尺度可以从纳米级到微米级到数百公里级, 时间尺度也可以从纳秒到数百或数千年不等。近些年来, 受益于计算能力的持续发展和对精密设备制造的大量投资, 数值模拟和多尺度实验室测试已成为地质力学及其相关领域的主流方法。科学家们为了求解多尺度和多物理场过程, 已经开发并成功应用了不同的本构理论、控制方程模型、数值离散方法、求解器等等。为此, 本专题收集在该研究领域具有代表性的研究成果, 涵盖用计算流体动力学和离散元法进行多层土的潜蚀模...

We present a Data-Driven framework for multiscale mechanical analysis of materials. The proposed relies on the formulation in mechanics (Kirchdoerfer and Ortiz 2016), with material data being directly extracted from lower-scale computations. Particular emphasis is placed two key elements: parametrization history, optimal sampling state space. demonstrate an application prediction behavior sand,...

It is argued that multiscale approaches are necessary for an explanatory modeling of biological systems. A first step, besides common to the multiscale modeling of physical and living systems, is a bottom-up integration based on the notions of effective parameters and minimal models. Top-down effects can be accounted for in terms of effective constraints and inputs. Biological systems are essen...

Multiscale modeling for cement-based materials, such as concrete, is a relatively young subject, but there are already a number of different approaches to study different aspects of these classical materials. In this paper, the parameter-passing multiscale modeling scheme is established and applied to address the multiscale modeling problem for the integrated system of cement paste, mortar, and...

This paper is concerned with the modeling and analysis of the orientation and distance between steel fibers in X-ray micro-tomography data. The advantage of combining both orientation and separation in a model is that it helps provide a detailed understanding of how the steel fibers are arranged, which is easy to compare. The developed models are designed to summarize the randomness of the orie...