On the treatment of solid boundary in smoothed particle hydrodynamics

Liu, Moubin; Shao, Jiaru; Chang, Jianzhong

doi:10.1007/s11431-011-4663-y

Cited by 120 publications

(40 citation statements)

References 17 publications

(21 reference statements)

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“…Over the years, several techniques have been proposed [Liu et al, 2012], and the implementation of solid boundaries is still a matter of discussion. In our code, the boundaries are made of two rows of fixed SPH particles similar to those that constitute the fluid, but with specific properties.…”

Section: Boundary Conditionsmentioning

confidence: 99%

SPH-Based Numerical Study of the Impact of Mudflows on Obstacles

Laigle

Labbé

2017

IJECE

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In this work, we study the impact of a transient free-surface flow of viscoplastic fluid on a rigid obstacle. This study is conducted numerically using the SPH (Smoothed Particle Hydrodynamics) method, and the Herschel-Bulkley rheological model. The SPH code and its specific adaptations to our needs are presented. The capacity of the code to meet the requirements of our objectives is validated on classic benchmarks. The virtual experiment setup is presented. The local characteristics of the flow near the obstacle, the length of the dead-zone of fluid at rest which forms upstream of the obstacle and the shape of the pressure signal applied to the obstacle are analyzed with reference to the inclination angle and Froude number of the incident flow. This analysis highlights the existence of two impact regimes referred to as the dead-zone and jet impact regimes respectively with a transition occurring for values of the Froude number about 1.3 to 1.5. These values are coherent with previous experimental studies.

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Section: Boundary Conditionsmentioning

confidence: 99%

SPH-Based Numerical Study of the Impact of Mudflows on Obstacles

Laigle

Labbé

2017

IJECE

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“…This boundary treatment was firstly proposed by Liu et al [29] and further modified by Chen et al and applied in multiphase simulations [22]. This boundary treatment was firstly proposed by Liu et al [29] and further modified by Chen et al and applied in multiphase simulations [22].…”

Section: Solid Boundary Treatmentmentioning

confidence: 99%

An SPH pressure correction algorithm for multiphase flows with large density ratio

Zhou

Cai

Zong

et al. 2015

Numerical Methods in Fluids

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Summary In this paper, we propose an interfacial pressure correction algorithm for smoothed particle hydrodynamics (SPH) simulation of multiphase flows with large density ratios. This correction term is based on the assumption of small deformation of the interface, and derived from perturbation expansion analysis. It is also proven to be applicable in cases with complex interfaces. This correction algorithm helps to overcome the discontinuities of the pressure gradient over the interfaces, which may cause unphysical gap between different phases. This proposed correction algorithm is implemented on a recent multiphase SPH model, which is based on the assumption of pressure continuity over the interfaces. The coupled dynamic solid boundary treatment is used to simulate solid walls; and a cut‐off pressure is applied to avoid negative particle pressure, which may cause computational instabilities in SPH. Three numerical examples of air–water flows, including sloshing, dam breaking, and water entry, are presented and compared with experimental data, indicating the robustness of our pressure correction algorithm in multiphase simulations with large density ratios. Copyright © 2015 John Wiley & Sons, Ltd.

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“…In this approach, at the first time step the algorithm can generate ghost particles in a regular or irregular distribution, like landslide boundary, and the ghost particle positions do not need to change during following steps. More details can be found in the original work by Liu et al (2012).…”

Section: Boundary Treatmentmentioning

confidence: 99%

Three-dimensional run-out analysis and prediction of flow-like landslides using smoothed particle hydrodynamics

Liu

2014

Environ Earth Sci

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Many landslides can often be characterized as a sort of landslides which move rapidly like flowing fluid and thus have a long run-out. They usually cause large damage and casualties especially when they are trigged by an earthquake or heavy rain. Numerical simulations of flowlike landslides are difficult due to the existence of free surface and large flow deformations. In this work, the smoothed particle hydrodynamics (SPH) method is applied to model two-and three-dimensional flow-like landslides for the run-out analysis. This is because SPH method is a meshfree, Lagrangian particle method, and is believed to be superior to conventional numerical methods in treating free surfaces, moving interfaces, and large deformations; hence, it is ideal in describing the complex fluidization characteristics in flow-like landslides. In this paper, a Bingham flow model and Navier-Stokes equations are incorporated into the SPH frame work, in which fluids are discretized by flow particles, and 3D terrain topography from GIS is represented by surface (or solid wall) particles.An improved SPH method is first applied to simulate the whole run-out processes of three flow-like landslides, which were triggered by Wenchuan earthquake that occurred in China in 2008. The effectiveness of the improved SPH method in modeling flow-like landslides is demonstrated by the good agreement of the 3D profile simulation results obtained from the present SPH simulation with field observation and results from other open sources. The SPH method is then used to predict the runout area of Jinpingzi landslide.

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On the treatment of solid boundary in smoothed particle hydrodynamics

Cited by 120 publications

References 17 publications

SPH-Based Numerical Study of the Impact of Mudflows on Obstacles

SPH-Based Numerical Study of the Impact of Mudflows on Obstacles

An SPH pressure correction algorithm for multiphase flows with large density ratio

Three-dimensional run-out analysis and prediction of flow-like landslides using smoothed particle hydrodynamics

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