Computers and Geotechnics, Journal Year: 2023, Volume and Issue: 163, P. 105720 - 105720
Published: Aug. 24, 2023
Language: Английский
Computers and Geotechnics, Journal Year: 2023, Volume and Issue: 163, P. 105720 - 105720
Published: Aug. 24, 2023
Language: Английский
Computers and Geotechnics, Journal Year: 2024, Volume and Issue: 177, P. 106818 - 106818
Published: Oct. 9, 2024
Language: Английский
Citations
4Computers and Geotechnics, Journal Year: 2023, Volume and Issue: 165, P. 105886 - 105886
Published: Oct. 30, 2023
Language: Английский
Citations
11International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2024, Volume and Issue: 48(7), P. 1774 - 1796
Published: Feb. 15, 2024
Abstract The greatest challenge when performing large deformation simulations using the CFD‐DEM coupling method lies in dynamical update of fluid meshes. To address this problem, a novel integrated with dynamic unstructured grid is proposed work. mesh initialization and reconstruction are performed by Constrained Delaunay triangulation (CDT) implemented tetgen algorithm. Moreover, equation state (EOS) introduced to consider impact compressibility. reliability preliminarily verified particle sedimentation test. Additionally, undrained triaxial shear one‐dimensional consolidation tests conducted examine applicability simulating geotechnical cases. From our analysis, it found that responses test obtained from direct accordance those led constant volume (CV) method. However, difficulties arise accurately describing moving boundary fixed mesh, leading unreliable results. test, both grids can capture Mandel—Cryer effect, which more pronounced under grid, mainly due dual loading device skeleton on fluid. A greater compressibility specified weakening whereas its duration increased. Our work provides valuable insights for effectively dealing boundaries.
Language: Английский
Citations
4Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)
Published: April 24, 2024
This paper optimizes the 2D Wadell roundness calculation of particles based on digital image processing methods. An algorithm for grouping corner key points is proposed to distinguish each independent corner. Additionally, cyclic midpoint filtering method introduced dealiasing, aiming mitigate aliasing issues effectively. The relationships between number pixels (m), central angle (α) and parameter dealiasing degree (n) are established. Krumbein chart a sandstone thin section were used as examples calculate roundness. A set regular shapes calculated, error this discussed. When α ≥ 30°, maximum 5.21%; when 12° ≤ < increases. By applying interpolation increase minimum (m
Language: Английский
Citations
4Proceedings of the National Academy of Sciences, Journal Year: 2025, Volume and Issue: 122(18)
Published: May 2, 2025
This paper presents pore unit assembly-discrete element model (PUA-DEM), a pore-scale hydromechanical framework that resolves interactions between mobile granular particles and multiphase fluids in unsaturated media. The uniquely integrates DEM with hydrodynamic models to capture flow dynamics, while leveraging two-way coupling mechanism ensure bidirectional fluid–grain feedback through stabilized domain partitioning. Further innovations include dynamic pore-merging retriangulation algorithm enhances computational efficiency for large-scale systems. Validated against experimental data glass beads Ottawa sand, PUA-DEM accurately reproduces critical phenomena-including capillary/viscous fingering, wetting-induced swelling/collapse, quasi-static deformation-under diverse saturation loading regimes. Numerical case studies reveal how capillary forces wetting fluid collectively govern response, from meniscus evolution macroscale instabilities. By bridging pore- particle-scale physics, advances predictive modeling of partially saturated systems, offering transformative insights geohazard mitigation, sustainable agriculture, pharmaceutical manufacturing, energy-related engineering applications.
Language: Английский
Citations
0Journal of Rock Mechanics and Geotechnical Engineering, Journal Year: 2025, Volume and Issue: unknown
Published: May 1, 2025
Language: Английский
Citations
0Computers and Geotechnics, Journal Year: 2025, Volume and Issue: 183, P. 107204 - 107204
Published: March 17, 2025
Language: Английский
Citations
0Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)
Published: April 1, 2025
Traditional computational fluid dynamics (CFD)-discrete element method (DEM)-volume of (VOF) three-phase coupling methods may produce inaccurate results in certain scenarios due to the assumption incompressible liquid and gas phases. In this study, a novel CFD-DEM-VOF is proposed, which integrates unified equation state account for compressibility both The α transport derived, fractional step proposed solving equation. Additionally, continuity incorporating coefficients derived used influence during pressure correction. algorithm validated through simulations three classic cases: single particle entering water from air, dam break, entry block. Moreover, unsaturated soil loading problems are investigated using method. indicate that liquid–gas interface begins rise only when deep soil, saturated with liquid, experiences significant disturbance. A comparison excess pore movement velocities particles two monitoring mesh layers below initial level reflects spatial response patterns under external loading. Finally, coefficient discussed.
Language: Английский
Citations
0Acta Geotechnica, Journal Year: 2024, Volume and Issue: 19(5), P. 3229 - 3239
Published: Feb. 8, 2024
Abstract Underground pipe defects or cracks under transport infrastructure can cause water leakage to upper soil layers (e.g. subgrade and capping), inducing local cavities even failure of overlying road/railway formation. Although numerous studies on the instability granular beds induced by injected have been conducted, most them focused behaviour saturated beds, while research dry is still limited. This paper aims address this gap using a numerical model coupling volume fluid method with discrete element method. We observed that go through three distinct regimes as jet velocity increases including stationary, stable deformation heave fluidisation. However, flow velocities required deform fluidise are significantly higher than those for beds. Increasing bed thickness alter its mechanism from full depth localised erosion, leading cavity formation around prior The gravitational frictional components mass identified two main resisting forces against force, evidenced increase critical particle density friction coefficient increase. Nevertheless, moblised zone practically independent both buried
Language: Английский
Citations
2Powder Technology, Journal Year: 2024, Volume and Issue: 441, P. 119811 - 119811
Published: May 1, 2024
Language: Английский
Citations
2