LOQUAT: an open-source GPU-accelerated SPH solver for geotechnical modeling

Peng, Chong; Wang, Shun; Wu, Wei; Yu, Hai‐Sui; Wang, Chun; Chen, Jianyu

doi:10.1007/s11440-019-00839-1

Cited by 84 publications

(60 citation statements)

References 80 publications

(99 reference statements)

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“…SPH has the so‐called short‐length‐scale‐noise, which causes stress oscillations in regions with large deformation . There are several approaches to improve the stress results . In this work, a stress regularization scheme called Shepard filter is employed to obtain smooth stress contours, as adopted in Nguyen et al The stress of each soil particle is regularized over its kernel integral domain after a certain number of computational steps using the following equation:

𝛔_{i}^{n e w} = \frac{\sum 𝛔_{i} W false(x_{i j} false)}{\sum W false(x_{i j} false)} .

In all SPH computations of this work, the correction is applied every 30 steps, which is sufficient to mitigate the stress oscillation and give good results for the stress prediction.…”

Section: Sph For Soil Modelingmentioning

confidence: 99%

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A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact method

Zhan

Peng

Zhang

et al. 2020

Num Anal Meth Geomechanics

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A smoothed particle hydrodynamics (SPH) framework for three-dimensional dynamic soil-multibody interaction modeling is presented, where both soils and rigid bodies are discretized using SPH particles. In the framework, soils are modeled using the Drucker-Prager model, while rigid bodies are considered with a multibody dynamics solver. A hybrid contact method suitable for three-dimensional simulations is developed to model the soil-body and body-body frictionless and frictional contacts, where contact forces are calculated based on ideal plastic collision and the unit normal/tangential vectors of the actual surface. Owing to its simplicity in contact detection and accuracy in contact force calculation, the hybrid contact method can be easily incorporated into SPH. Furthermore, graphics processing unit (GPU) parallelization is utilized to improve efficiency. The presented numerical framework and the hybrid contact method are validated using several examples. Numerical results are compared with analytical solutions and results from the literature. Furthermore, two three-dimensional simulations involving dynamic soil-multibody interaction are included to demonstrate the application.

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𝛔_{i}^{n e w} = \frac{\sum 𝛔_{i} W false(x_{i j} false)}{\sum W false(x_{i j} false)} .

In all SPH computations of this work, the correction is applied every 30 steps, which is sufficient to mitigate the stress oscillation and give good results for the stress prediction.…”

Section: Sph For Soil Modelingmentioning

confidence: 99%

“…The presented SPH framework and the hybrid contact method are implemented in the open‐source GPU‐accelerated SPH solver LOQUAT . In this section, four numerical examples are included to show the performance of the method.…”

Section: Validationsmentioning

confidence: 99%

A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact method

Zhan

Peng

Zhang

et al. 2020

Num Anal Meth Geomechanics

Self Cite

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“…This basic model has several merits such as simplicity and robustness in numerical simulation. These advantages make it an interesting stand-alone model for many applications [30,31,36,38,46] and further developments [19,20,39].…”

Section: A Basic Hypoplastic Modelmentioning

confidence: 99%

Extension of a basic hypoplastic model for overconsolidated clays

Wang

Zhang

et al. 2020

Computers and Geotechnics

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This paper presents a hypoplastic constitutive model for overconsolidated clays. The model is developed based on a basic model proposed recently for sand. New density and stiffness factors are introduced to account for history dependence. The model is capable of predicting a desirable asymptotic state boundary surface for overconsolidated clays. Validation with experimental results shows this model can properly describe the main features of overconsolidated clays.

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“…More recent development of numerical techniques for large deformation analysis in geotechnics provides the possibility of simulating both the failure and post-failure stages. Representative numerical approaches of this capability include, but are not limited to, the Arbitrary Lagrangian-Eulerian (ALE) technique [8], the Coupled Eulerian-Lagrangian (CEL) method [12,30], the Material Point Method (MPM) [32], the Particle Finite Element Method (PFEM) [27,46,48], and the Smooth Particle Hydrodynamics (SPH) [9,23,28,38,44,45]. Recently, the CEL method has been adopted to investigate the large deformation behavior of clayey slopes under seismic loading with the weakening of clays being concerned [12].…”

Section: Introductionmentioning

confidence: 99%

Large deformation dynamic analysis of progressive failure in layered clayey slopes under seismic loading using the particle finite element method

2021

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This paper presents the failure analysis of layered clayey slopes with emphasis on the combined effect of the clay’s weakening behavior and the seismic loading using the particle finite element method (PFEM). Diverse failure mechanisms have been disclosed via the PFEM modelling when the strain-weakening behavior of clay is concerned. In contrast to a single layered slope exhibiting either a shallow or a deep failure mode, a layered slope may undergo both failure modes with a time interval in between. Seismic loadings also enlarge the scale of slope failure in clays with weakening behavior. The failure of a real layered slope (i.e. the 1988 Saint-Adelphe landslide, Canada) triggered by the Saguenay earthquake is also studied in this paper. The simulation results reveal that the choice of the strain-softening value controls the slip surface of the landslide and the amplification effect is important in the triggering of the landslide.

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LOQUAT: an open-source GPU-accelerated SPH solver for geotechnical modeling

Cited by 84 publications

References 80 publications

A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact method

A SPH framework for dynamic interaction between soil and rigid body system with hybrid contact method

Extension of a basic hypoplastic model for overconsolidated clays

Large deformation dynamic analysis of progressive failure in layered clayey slopes under seismic loading using the particle finite element method

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