Tian Tian¹, Huayi Wei^2,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.4, pp. 1-2, 2025, DOI:10.32604/icces.2025.011175

Abstract Brittle fracture is a critical failure mode in structural materials, and accurately simulating its evolution is essential for engineering design, material performance evaluation, and failure prediction. Traditional numerical methods, however, face significant challenges when dealing with higher-order fracture models and complex fracture behaviors. To overcome these challenges, this study proposes an innovative simulation framework based on higher-order finite element methods and adaptive mesh refinement, effectively balancing computational efficiency and simulation accuracy.
The research first develops a higher-order finite element method for the continuum damage fracture phase-field model. By incorporating higher-order finite element techniques, the proposed method… More >

Yuan Mei^1,2, Daokui Li^1,2, Shiming Zhou^1,2,*, Zhibin Shen^1,2

CMES-Computer Modeling in Engineering & Sciences, Vol.145, No.1, pp. 153-187, 2025, DOI:10.32604/cmes.2025.070252 - 30 October 2025

Abstract Viscoelastic solids, such as composite propellants, exhibit significant time and rate dependencies, and their fracture processes display high levels of nonlinearity. However, the correlation between crack propagation and viscoelastic energy dissipation in these materials remains unclear. Therefore, accurately modeling and understanding of their fracture behavior is crucial for relevant engineering applications. This study proposes a novel viscoelastic phase-field model. In the numerical implementation, the adopted adaptive time-stepping iterative strategy effectively accelerates the coupling iteration efficiency between the phase-field and the displacement field. Moreover, all unknown parameters in the model, including the form of the phase-field More >

Junchen Liu¹, Feng Zhou¹, Xiaofeng Lu¹, Xiaojin Zhou², Xianjun He¹, Yurou Du³, Fuguo Xia¹, Junfu Zhang⁴, Weiyi Luo^4,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.10, pp. 2613-2628, 2025, DOI:10.32604/fdmp.2025.069772 - 30 October 2025

Abstract In shale gas reservoir stimulation, proppants are essential for sustaining fracture conductivity. However, increasing closing stress causes proppants to embed into the rock matrix, leading to a progressive decline in fracture permeability and conductivity. Furthermore, rock creep contributes to long-term reductions in fracture performance. To elucidate the combined effects of proppant embedding and rock creep on sustained conductivity, this study conducted controlled experiments examining conductivity decay in propped fractures under varying closing stresses, explicitly accounting for both mechanisms. An embedded discrete fracture model was developed to simulate reservoir production under different conductivity decay scenarios, while… More >

Yuheng Cao, Chunyu Zhang^*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.2, pp. 1-1, 2025, DOI:10.32604/icces.2025.010692

Abstract A unified high-order damaged elasticity theory is proposed for quasi-brittle fracture problems by incorporating higher-order gradients for both strain and damage fields. The single scale parameter is defined by the size of the representative volume element (RVE). It formulates the degraded strain energy density to capture size effects and localized damage initiation/propagation with a damage criterion grounded in experimental observations. The structural deformation is solved by using the principle of minimum potential energy with the Augmented Lagrangian Method (ALM) enforcing damage evolution constraints. This simplifies the equilibrium equations, enabling efficient numerical solutions via the Galerkin More >

Mao Jiang¹, Jianshu Wu¹, Chengyong Peng¹, Xuesong Xing¹, Yishan Lou^2,3, Yi Liu^2,3,*, Shanyong Liu^2,3

Energy Engineering, Vol.122, No.10, pp. 4019-4034, 2025, DOI:10.32604/ee.2025.067236 - 30 September 2025

Abstract Fracture conductivity is a key factor to determine the fracturing effect. Optimizing proppant particle size distribution is critical for ensuring efficient proppant placement within fractures. To address challenges associated with the low-permeability reservoirs in the Lufeng Oilfield of the South China Sea—including high heterogeneity, complex lithology, and suboptimal fracturing outcomes—JRC (Joint Roughness Coefficient) was employed to quantitatively characterize the lithological properties of the target formation. A CFD-DEM (Computational Fluid Dynamics-Discrete Element Method) two-way coupling approach was then utilized to construct a fracture channel model that simulates proppant transport dynamics. The proppant particle size under different… More >

Anshul Pandey, Sachin Kumar^*

CMES-Computer Modeling in Engineering & Sciences, Vol.144, No.3, pp. 3251-3286, 2025, DOI:10.32604/cmes.2025.067858 - 30 September 2025

Abstract The phase field model can coherently address the relatively complex fracture phenomenon, such as crack nucleation, branching, deflection, etc. The model has been extensively implemented in the finite element package Abaqus to solve brittle fracture problems in recent studies. However, accurate numerical analysis typically requires fine meshes to model the evolving crack path effectively. A broad region must be discretized without prior knowledge of the crack path, further augmenting the computational expenses. In this proposed work, we present an automated framework utilizing a posteriori error-indicator (MISESERI) to demarcate and sufficiently refine the mesh along the… More >

Weishuai Zhang, Fengjiao Wang, Yikun Liu^*, Yilin Liu

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.1, pp. 1-1, 2025, DOI:10.32604/icces.2025.010789

Abstract The mechanism of vertical extension in high-volume hydraulic fracturing is of significant importance for the volumetric transformation of low-permeability reservoirs in deep offshore sandstone formations. The complexity of fracture propagation behavior is influenced by the characteristics of discontinuous thin layers in the vertical plane. However, the mechanisms and influencing factors of fracture extension in the vertical direction during high-volume hydraulic fracturing remain unclear. This study integrates true triaxial hydraulic fracturing experiments with acoustic emission (AE) monitoring, employing a nonlinear finite element method to establish a multi-thin interlayer fracturing model based on seepage-stress-damage coupling. It investigates… More >

Guoqiang Long^*, Wenling Chen, Yanghui Ou, Shuting Yang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.1, pp. 1-1, 2025, DOI:10.32604/icces.2025.010487

Abstract China's marine carbonate rocks are widely distributed, the reservoir is deeply buried, high temperature, high closure pressure, and the reservoir has strong non-homogeneity, porosity and permeability are generally low, while the natural cracks and dissolution pore (hole) is more developed. Currently, carbonate reservoir reforming technology is developing rapidly, and more and more marine carbonates can be developed. The Permian Maokou-Qixia Formation in the Sichuan Basin has good hydrocarbon source rocks of marine carbonates. The Longniusi Hechuan block of Permian Maokou-Qixia Formation develops a set of carbonate reservoirs interacting with leopard dolomite and mud crystal clastic… More >

Xuewei Liu^1,2, Jinze Sun^1,2, Bin Liu^1,2,*, Yongshui Kang^1,2, Yongchao Tian³, Yuan Zhou^1,2, Quansheng Liu⁴

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.8, pp. 2047-2073, 2025, DOI:10.32604/fdmp.2025.068268 - 12 September 2025

Abstract Grouting is a widely applied technique for reinforcing fractured zones in deep soft rock tunnels. By infiltrating rock fissures, slurry materials enhance structural integrity and improve the overall stability of the surrounding rock. The performance of grouting is primarily governed by the flow behavior and diffusion extent of the slurry. This review considers recent advances in the theory and methodology of slurry flow and diffusion in fractured rock. It examines commonly used grout materials, including cement-based, chemical, and composite formulations, each offering distinct advantages for specific geological conditions. The mechanisms of reinforcement vary significantly across… More >

Taizhi Shen¹, Gang Chen¹, Jiang Bai¹, Dan Zhang^2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.8, pp. 1917-1934, 2025, DOI:10.32604/fdmp.2025.067114 - 12 September 2025

Abstract Deep shale reservoirs are often associated with extreme geological conditions, including high temperatures, substantial horizontal stress differences, elevated closure stresses, and high breakdown pressures. These factors pose significant challenges to conventional hydraulic fracturing with water-based fluids, which may induce formation damage and fail to generate complex fracture networks. Supercritical carbon dioxide (SC-CO₂), with its low viscosity, high diffusivity, low surface tension, and minimal water sensitivity, has attracted growing attention as an alternative fracturing fluid for deep shale stimulation. This study presents a series of true triaxial large-scale physical experiments using shale samples from the Longmaxi Formation More >