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2606.20025 2026-06-19 physics.geo-ph cs.NA math.NA 新提交

Acceleration methods for the planar 3D ILSA hydraulic fracturing model

平面3D ILSA水力压裂模型的加速方法

V. I. Shukalo, A. V. Valov, A. N. Baykin

AI总结 针对平面3D ILSA水力压裂模型计算成本高的问题,提出统一迭代方案、矩阵分裂、Anderson加速和预测-校正等加速策略,在保持精度下实现平均4倍加速,最高11倍。

Comments 56 pages, 35 figures. Submitted for publication

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AI中文摘要

水力压裂的平面3D模型在具有限制性几何假设的模型和全3D模拟器之间提供了实用的平衡,能够以适中的计算成本捕捉具有任意平面足迹的裂缝。然而,诸如处理设计优化和微型压裂测试解释等应用需要大量的模拟集合,平面3D模型的成本仍然是显著瓶颈。本文提出了平面3D隐式水平集算法(ILSA)的加速策略,以减少模拟运行时间同时保持数值精度。引入了一个统一的平面3D ILSA方案,将弹性流体动力学求解器和前沿追踪算法的嵌套循环合并为单个迭代过程。对线性化的弹性流体动力学系统应用矩阵分裂方法,将弹性算子的稠密部分移到右侧,产生一个可以更高效求解的稀疏系统矩阵。将Anderson加速纳入弹性流体动力学系统的求解中,以改善在不同裂缝几何形状下的收敛性。此外,结合所提出的方法检查了预测-校正方案,以评估它们的组合效果。在五个基准案例上,分别和组合评估了每种技术在参考和统一平面3D ILSA方案上的表现。数值实验表明,仅统一方案就实现了平均2.5倍的加速,对于沙漏几何形状达到5.7倍。所有技术的组合应用实现了平均4倍的加速,对于沙漏案例高达11倍,与参考方案相比,裂缝开度的相对差异低于5%。

英文摘要

Planar 3D models of hydraulic fracturing provide a practical balance between models with restrictive geometric assumptions and fully 3D simulators, capturing fractures with arbitrary planar footprints at moderate computational cost. Nevertheless, applications such as treatment design optimization and mini-frac test interpretation require large ensembles of simulations, for which the cost of planar 3D models remains a significant bottleneck. This work presents acceleration strategies for the planar 3D Implicit Level Set Algorithm (ILSA) to reduce simulation runtime while preserving numerical accuracy. A unified planar 3D ILSA scheme that consolidates the nested loops of the elastohydrodynamic solver and the front tracking algorithm into a single iterative process is introduced. A matrix splitting approach is applied to the linearized elastohydrodynamic system, moving the dense part of the elasticity operator to the right-hand side and yielding a sparse system matrix that can be solved more efficiently. Anderson acceleration is incorporated into the solution of the elastohydrodynamic system to improve convergence under varying fracture geometry. Additionally, a predictor--corrector scheme is examined with the proposed methods to assess their combined effect. Each technique is evaluated individually and in combination on both the reference and unified planar 3D ILSA schemes across five benchmark cases. Numerical experiments demonstrate that the unified scheme alone delivers an average 2.5x speedup, reaching 5.7x for the sandglass geometry. The combined application of all techniques achieves an average 4x speedup and up to 11x for the sandglass case, with the relative discrepancy in fracture aperture below 5% compared with the reference scheme.

2606.20329 2026-06-19 cs.LG physics.geo-ph 交叉投稿

Constrained hybrid modelling to predict microbial dynamics and organic matter turnover in soil systems

约束混合建模预测土壤系统中微生物动态与有机质周转

Paul Collart, Juergen Gall, Andrea Schnepf, Holger Pagel, Lars Doorenbos

发表机构 * Agrosphere (IBG-3), Forschungszentrum Jülich GmbH(农业圈(IBG-3),于利希研究中心) Institute of Crop Science and Resource Conservation, University of Bonn(波恩大学作物科学与资源保护研究所) Institute of Computer Science, University of Bonn(波恩大学计算机科学研究所) Lamarr Institute for Machine Learning and Artificial Intelligence(拉马尔机器学习和人工智能研究所)

AI总结 提出首个混合建模框架,利用神经网络从宏基因组推断功能性状预测过程模型参数,并整合生态理论约束,有效预测微生物动态和有机质周转。

Comments Accepted at ICML '26

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AI中文摘要

土壤微生物控制有机质循环,并在很大程度上决定土壤系统如何应对和缓解气候变化及环境威胁。因此,在基于过程的土壤模型中表示微生物动态对于预测土壤碳循环至关重要,尽管从数据中获取信息极具挑战性。改进参数化的一个有前景的方法是整合基因组数据,然而建模基因组与微生物驱动过程之间复杂且未知的关系是一个未解决的问题。在这项工作中,我们提出了第一个混合建模框架,用于从基于DNA测序数据的宏基因组推断功能性状中推导基于过程的土壤有机质周转模型的生物动力学参数值。我们的模型通过神经网络从基因组性状数据预测过程模型的生物动力学参数,并整合来自生态理论和文献的约束,以确保即使是非观测状态变量也能实现逼真的行为。我们在不同复杂度的合成基因组性状数据集和真实数据上评估了我们的方法,结果表明,我们的方法在多个基线上提高了性能,并有效学习了过程模型中不可测量组分的动态,即使是在小训练数据集上也是如此。

英文摘要

Soil microorganisms control organic matter cycling and largely determine how soil systems can cope with and mitigate climate change and environmental threats. Representing microbial dynamics in process-based soil models is therefore critical to predict carbon cycling in soils, albeit highly challenging to inform from data. One promising approach to improve their parametrisation is the integration of genomic data, yet modelling the complex and unknown relationship between genomes and the processes the microbes are driving is an unsolved problem. In this work, we present the first hybrid modeling framework for deriving biokinetic parameter values of a process-based soil organic matter turnover model from metagenome-inferred functional traits based on DNA sequencing data. Our model predicts biokinetic parameters of the process-based model from genomic trait data with a neural network and integrates constraints from ecological theory and literature to ensure realistic behavior, even of non-observed state variables. We evaluate our method on synthetic genomic trait datasets of varying complexity and on real data, showing that our approach improves performance over multiple baselines and learns the dynamics of unmeasurable components of the process-based model effectively, even for small training datasets.

2606.20249 2026-06-19 astro-ph.EP physics.geo-ph 交叉投稿

Geophysical and atmospheric implications of $f$O$_{2}$-dependent melting on rocky exoplanets

岩石系外行星上依赖于氧逸度的熔融对地球物理和大气的影响

Mariana Sastre, Tim Lichtenberg, Laurent Soucasse, Dan J. Bower, Harrison Nicholls, Inga Kamp

AI总结 通过耦合内部-大气框架PROTEUS,量化了氧逸度依赖的熔融曲线对岩石系外行星热结构、熔融分数和流变演化的非线性影响,揭示了挥发分库存和表面氧逸度对热状态的主要调控作用。

Comments 15 pages, 8 figures; accepted for publication in Astronomy & Astrophysics

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AI中文摘要

长期存在的岩浆海洋的地球化学演化受到熔融地幔与大气之间挥发性交换的强烈调控。对于处于失控温室极限内的行星,这种耦合演化可以持续数十亿年。然而,大多数现有研究假设类地(氧化)条件,并忽略了氧化还原状态对熔体热力学和挥发性释放的影响。我们量化了在耦合内部-大气框架PROTEUS中实现的实验推导的、氧逸度依赖的熔融曲线如何传播到岩石系外行星内部的热结构、熔融分数和流变演化,并将其应用于短周期超级地球GJ 1132 b。我们发现熔融曲线的变化导致强烈的非线性热响应。在贫挥发分系统中,相对于氧化和类地情况,还原熔融曲线促进了早期深部地幔结晶,有利于由温室效应维持的晚期表面岩浆海洋,而氧化熔融曲线则维持较高的熔融分数和垂直延伸的岩浆海洋。还原地幔产生大量的H$_2$-CO富集大气;氧化地幔则倾向于较薄的H$_2$O-CO$_2$包层。在富挥发分系统中,内部在高熔融分数下达到辐射平衡,维持稳态全球岩浆海洋,其中熔融曲线的变化不会显著影响凝固时间。这表明了层次控制:挥发分库存和表面氧逸度作为热状态的主要调节者,而氧逸度依赖的熔融关系提供次级调制。这些对比鲜明的状态产生不同的大气组成和形成时间尺度,为近距离岩石系外行星提供了可测试的光谱预测,这些预测可通过即将进行的JWST观测进行评估。

英文摘要

The geochemical evolution of long-lived magma oceans is strongly regulated by volatile exchange between the molten mantle and the atmosphere. For planets inside the runaway-greenhouse limit, this coupled evolution can persist for billions of years. However, most existing studies assume Earth-like (oxidized) conditions and neglect the influence of redox state on melt thermodynamics and volatile release. We quantified how experimentally derived, oxygen-fugacity-dependent melting curves implemented within the coupled interior-atmosphere framework PROTEUS propagate into the thermal structure, melt fraction, and rheological evolution of rocky exoplanet interiors, applying this to the short-period super-Earth GJ 1132 b. We found strongly non-linear thermal responses to variations in melting curves. In volatile-poor systems, reduced melting curves promote earlier deep-mantle crystallisation relative to oxidised and Earth-like cases, favouring late-stage surface magma oceans sustained by greenhouse warming, while oxidized melting curves maintain higher melt fractions and a vertically extended magma ocean. Reduced mantles produce massive H$_2$-CO-rich atmospheres; oxidized mantles favour thinner H$_2$O-CO$_2$ envelopes. In volatile-rich systems, the interior reaches radiative equilibrium at high melt fractions, sustaining a steady-state global magma ocean in which melting curve variations do not significantly influence solidification timing. This indicates a hierarchical control: volatile inventory and surface oxygen fugacity act as the primary regulators of thermal state, while oxygen-fugacity-dependent melting relations provide a secondary modulation. These contrasting regimes produce distinct atmospheric compositions and formation timescales, offering testable spectral predictions for close-in rocky exoplanets evaluable with forthcoming JWST observations.