An improved multi-phase weakly-compressible SPH model for modeling various landslides

2022 ◽  
pp. 117120
Author(s):  
Youting Qi ◽  
Jianyun Chen ◽  
Guibin Zhang ◽  
Qiang Xu ◽  
Jing Li
Keyword(s):  
Weakly Compressible ◽  
Sph Model ◽  
Multi Phase

A Numerical Investigation Into the Impact Pressures of Different Base Forms Using SPH Method

2014 ◽  
Author(s):  
Zhen Chen ◽  
Li Zou ◽  
Zhi Zong
Keyword(s):  
Free Surface Flows ◽  
Solid Boundary ◽  
Sph Method ◽  
Strong Discontinuities ◽  
Weakly Compressible ◽  
Base Form ◽  
Boundary Treatment ◽  
Sph Model ◽  
Dam Breaking ◽  
The Impact

In this paper, the impact pressures of two different base forms are comparatively studied using Smoothed Particle Hydrodynamics (SPH) method. It is summarized from previous works that the improved weakly compressible SPH model shows better performances than incompressible SPH model in numerical simulations of free surface flows accompany with large deformations and strong discontinuities. Such advantages are observed in numerical accuracy, stability and efficiency. The weakly compressible SPH model used in this paper is equipped with some new correction algorithms, among which include the density reinitialization algorithm and a new coupled dynamic Solid Boundary Treatment (SBT) on solid boundaries. The new boundary treatment combines the advantages of both the repulsive boundary treatment and the dynamic boundary treatment, intending to obtain more stable and accurate numerical results. A benchmark test of dam breaking is conducted to prove the reliability of the numerical model used in this paper. Two representative cases, among which one has one cavity and the other one has three cavities, are numerically investigated and compared to support the conclusion that the base form with cavities generally experience lower local and overall impact pressures than the base form of flat plate. It is found that with the application of cavities on the bottom, the peak values of the boundary pressure near central bottom significantly decrease, leading to smaller force load and better structural stability. The mechanisms of such phenomenon might be the pressure absorption effect conducted by the cavities.

scholarly journals Multi-phase SPH model for simulation of erosion and scouring by means of the shields and Drucker–Prager criteria.

2018 ◽  
Vol 117 ◽  
pp. 98-114 ◽  
Author(s):  
Elizabeth H. Zubeldia ◽  
Georgios Fourtakas ◽  
Benedict D. Rogers ◽  
Márcio M. Farias
Keyword(s):  
Sph Model ◽  
Multi Phase

scholarly journals Detailed study on the extension of the δ-SPH model to multi-phase flow

2020 ◽  
Vol 368 ◽  
pp. 113189 ◽  
Author(s):  
I. Hammani ◽  
S. Marrone ◽  
A. Colagrossi ◽  
G. Oger ◽  
D. Le Touzé
Keyword(s):  
Phase Flow ◽  
Sph Model ◽  
Multi Phase Flow ◽  
Multi Phase

scholarly journals NUMERICAL MODELLING OF LARGE-SCALE COASTAL WAVE IMPACTS IN SHALLOW FORESHORE CONDITIONS

2020 ◽  
pp. 24
Author(s):  
Vincent Gruwez ◽  
Corrado Altomare ◽  
Tomohiro Suzuki ◽  
Maximilian Streicher ◽  
Lorenzo Cappietti ◽  
...  
Keyword(s):  
Time Series ◽  
Numerical Modelling ◽  
Open Source ◽  
Large Scale ◽  
Model Comparison ◽  
Model Performance ◽  
Rans Model ◽  
Cfd Models ◽  
Weakly Compressible ◽  
Sph Model

Three open-source CFD models are applied to reproduce large-scale experiments of coastal wave impacts in shallow foreshore conditions: (1) a RANS model (OpenFOAM), (2) a weakly compressible SPH model (DualSPHysics), and (3) a non-hydrostatic NLSW equations model (SWASH). An inter-model comparison is done both qualitatively (time series, snapshots) and quantitatively (model performance and pattern statistics) to determine their practical applicability for this case.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/lOBMI8HGACs

Experimental and Numerical Investigation of Tsunami-Like Waves on Horizontal Circular Cylinders

2017 ◽  
Author(s):  
Giuseppe Tripepi ◽  
Francesco Aristodemo ◽  
Paolo Veltri ◽  
Calogero Pace ◽  
Andrea Solano ◽  
...  
Keyword(s):  
Numerical Study ◽  
Circular Cylinders ◽  
Pressure Transducers ◽  
Wave Flume ◽  
Weakly Compressible ◽  
Calibration Methods ◽  
Sph Model ◽  
Horizontal Cylinders ◽  
The University ◽  
Semi Empirical

This work deals with an experimental and numerical study on the horizontal and vertical hydrodynamic forces induced by tsunami-like waves on horizontal cylinders. The laboratory investigation has been performed in the wave flume of the University of Calabria. Twelve pressure transducers have been mounted along the external contour of a cylinder, while four wave gauges have been located close to the cylinder and an ultrasonic sensor behind the paddle to measure its displacement. Tests have been carried out for Keulegan-Carpenter numbers, KC, ranging from about 4 to 7. By the numerical viewpoint, a diffusive weakly-compressible SPH model has been adopted. To prevent spurious flows near the cylindrical contour, a packing algorithm has been applied before SPH simulations. The acoustic components occurring in the numerical pressure field have been filtered through the application of Wavelet Transform. By using different calibration methods, experimental and SPH forces and kinematics at the cylinder have been used to calculate the hydrodynamic coefficients in the Morison and transverse semi-empirical equations for engineering purposes.

scholarly journals Assessment of Dynamic Pressures at Vertical and Perforated Breakwaters through Diffusive SPH Schemes

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Francesco Aristodemo ◽  
Domenico Davide Meringolo ◽  
Paul Groenenboom ◽  
Andrea Lo Schiavo ◽  
Paolo Veltri ◽  
...  
Keyword(s):  
Coastal Structures ◽  
Pressure Drops ◽  
Hybrid Formulation ◽  
Time Space ◽  
Numerical Noise ◽  
Weakly Compressible ◽  
Flow Motion ◽  
Sph Model ◽  
Diffusive Term ◽  
Nonlinear Trends

This paper deals with the development of a 2D weakly compressible SPH model to simulate wave pressures acting on vertical and slotted coastal structures. Attention is devoted to investigate the diffusive term in the continuity equation in order to smooth out the high-frequency numerical noise in the pressure field. A hybrid formulation based on two literature diffusive models is proposed. The interaction between regular waves with vertical and perforated breakwaters is analyzed in time, space, and frequency domain. Numerical results are compared with laboratory experiments and other diffusive SPH formulations, varying the magnitude of the adopted diffusive term. On the basis of an error analysis, the results show that the hybrid formulation gives a better agreement with the experimental data for the majority of the investigated cases. Moreover, SPH simulations highlight nonlinear trends of dynamic pressures in correspondence with geometrical singularities, such as the holes of slotted walls, due to strong pressure drops induced by the flow motion.

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