scholarly journals NUMERICAL STUDY ON MOVEMENT OF TSUNAMI BOULDER AND STORM BOULDER BY SPH METHOD

2020 ◽  
pp. 15
Author(s):  
Takashi Yamamoto ◽  
Tomohiro Yasuda
Keyword(s):  
Numerical Study ◽  
Irregular Waves ◽  
Sph Method ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Particle Hydrodynamics ◽  
Movement Mechanism ◽  
Smoothed Particle ◽  
The Difference ◽  
Caisson Breakwater

Smoothed Particle Hydrodynamics (SPH) is known as very useful method for large deformation problems, such as movement of wave absorbing blocks and sliding of caisson breakwater. Also, in the coastal area, boulders launched by tsunami and by high waves with typhoons (named tsunami boulders and storm boulders) are focused on because of risk assessment towards the tsunami or super typhoons. However, the difference of their movement mechanism have been rarely investigated in detail. This study aims to simulate the movement of the tsunami boulders and storm boulders, comparing with the hydraulic experiment, and evaluating the transport characteristics. Wave elevation and boulder displacement were reproduced in the numerical wave flume well compared to physical model. Also, there is difference between solitary and irregular waves when waves act on boulders.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/WOfXbU7m_8E

Numerical Simulations of Regular Wave Impact on Horizontal Plate Based on SPH Methods

2013 ◽  
Vol 353-356 ◽  
pp. 3531-3536
Author(s):  
Kun Zheng ◽  
Zhao Chen Sun ◽  
Chang Ping Chen ◽  
Feng Zhou
Keyword(s):  
Estimation Method ◽  
Impact Pressure ◽  
Horizontal Plate ◽  
Regular Waves ◽  
Wave Impact ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
The Impact

The numerical wave flume was established for simulating the impact effects of regular waves on horizontal plate by adopting the method of Smoothed Particle Hydrodynamics (SPH).The impact process of regular waves on horizontal plate was analyzed, and the impact pressure-time curves were gotten using a new estimation method. The comparison of numerical results and experimental results shows that the new estimation method can predict the peak impact pressure more accurately.

scholarly journals Application of Multiphase Particle Methods in Atomization and Breakup Regimes of Liquid Jets

2014 ◽  
Author(s):  
Amirsaman Farrokhpanah ◽  
Javad Mostaghimi
Keyword(s):  
Numerical Study ◽  
Particle Methods ◽  
Liquid Jets ◽  
Empirical Correlations ◽  
Good Match ◽  
Sph Method ◽  
Jet Breakup ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Critical Weber Number

Multiphase Smoothed Particle Hydrodynamics (SPH) method has been used to study the jet breakup phenomena. It has been shown that this method is well capable of capturing different jet breakup characteristics. The value obtained for critical Weber number here in transition from dripping to jetting is a very good match to available values in literature. Jet breakup lengths are also agreeing well with several empirical correlations. Successful usage of SPH, as a comparably fast CFD solver, in jet breakup analysis helps in speeding up the numerical study of this phenomenon.

Meshless Modeling of the Breakage Process of a Coal Prism within Vertical Roller Mills

2013 ◽  
Vol 683 ◽  
pp. 492-496
Author(s):  
Yao Lu Liu ◽  
Yuan De Zhou
Keyword(s):  
Working Conditions ◽  
Numerical Study ◽  
Reaction Force ◽  
Numerical Approach ◽  
The Finite Element Method ◽  
Coal Specimen ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Vertical Roller

This paper presents an investigation into the roll compression induced breakage process of a coal prism within a vertical roller mill. The targeted process was characterized by strong nonlinearities arisen from large deformation, and from original continuum to final discontinuum. A numerical approach coupling the Smoothed Particle Hydrodynamics (SPH) method and the finite element method (FEM) was developed for such a type of analysis. The SPH method was used to model a coal prism and its interaction with the mill structure, while the roller and the support table in the mill were modeled with the FEM. This computational model makes it possible to predict the deformation and progressive disintegration process in the coal prism, as well as the reaction force mobilized along the specimen-roller interface. Using a cubic coal specimen as an instance, the paper presents a preliminary numerical study under prescribed geometry and working conditions of a mill machine. Typical results of the breakage process as well as the development of contact force were provided and discussed.

A Study on Damage Properties of Explosive Internal-Blast of Concrete

2012 ◽  
Vol 598 ◽  
pp. 420-424
Author(s):  
Qing Tao Wang ◽  
Jue Ding ◽  
Meng Kan Ying ◽  
Bao Liang Zhang
Keyword(s):  
Energy Release ◽  
Numerical Study ◽  
Damage Effect ◽  
Building Structures ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Detonation Process ◽  
Release Model ◽  
Heavy Damage

Blast can cause serious loss of people live and property，and heavy damage on building structures. So, a numerical study on internal-blast-field characteristics and dynamic response of concrete by aluminized explosive was conducted. Moreover, three energy release models of aluminized explosive with combustion effects were compared and analyzed. The numerical study shows that the ignition and growth model is one three-form equation of reaction rate, which can describe unsteady detonation process of non-ideal explosives well. So, in this paper, the energy release model of aluminized explosive based on the Lee-Tarver rate equation was utilized, and an internal-blast dynamic model of concrete was established. The smoothed particle hydrodynamics (SPH) method was adopted to research the explosion field and damage effects of concrete, and provides an important way to evaluate the damage effect of internal-blast of the concrete.

Numerical study of underwater dispersion of dilute and dense sediment–water mixtures

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840037
Author(s):  
Ziying Chan ◽  
Ho-Minh Dao ◽  
Danielle S. Tan
Keyword(s):  
Numerical Study ◽  
Water Mixture ◽  
Volumetric Concentration ◽  
Sph Method ◽  
Solids Concentration ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Harvesting Process ◽  
Ecological Concern ◽  
Settling Process

As part of the nodule-harvesting process, sediment tailings are released underwater. Due to the long period of clouding in the water during the settling process, this presents a significant environmental and ecological concern. One possible solution is to release a mixture of sediment tailings and seawater, with the aim of reducing the settling duration as well as the amount of spreading. In this paper, we present some results of numerical simulations using the smoothed particle hydrodynamics (SPH) method to model the release of a fixed volume of pre-mixed sediment–water mixture into a larger body of quiescent water. Both the sediment–water mixture and the “clean” water are modeled as two different fluids, with concentration-dependent bulk properties of the sediment–water mixture adjusted according to the initial solids concentration. This numerical model was validated in a previous study, which indicated significant differences in the dispersion and settling process between dilute and dense mixtures, and that a dense mixture may be preferable. For this study, we investigate a wider range of volumetric concentration with the aim of determining the optimum volumetric concentration, as well as its overall effectiveness compared to the original process (100% sediment).

scholarly journals Numerical Simulation of Non-Homogeneous Viscous Debris-Flows Based on the Smoothed Particle Hydrodynamics (SPH) Method

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2314 ◽  
Author(s):  
Shu Wang ◽  
Anping Shu ◽  
Matteo Rubinato ◽  
Mengyao Wang ◽  
Jiping Qin
Keyword(s):  
Debris Flow ◽  
Water Content ◽  
Smoothed Particle Hydrodynamics ◽  
Debris Flows ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Sph Model ◽  
Smoothed Particle ◽  
The Impact ◽  
Kinetic And Potential Energies

Non-homogeneous viscous debris flows are characterized by high density, impact force and destructiveness, and the complexity of the materials they are made of. This has always made these flows challenging to simulate numerically, and to reproduce experimentally debris flow processes. In this study, the formation-movement process of non-homogeneous debris flow under three different soil configurations was simulated numerically by modifying the formulation of collision, friction, and yield stresses for the existing Smoothed Particle Hydrodynamics (SPH) method. The results obtained by applying this modification to the SPH model clearly demonstrated that the configuration where fine and coarse particles are fully mixed, with no specific layering, produces more fluctuations and instability of the debris flow. The kinetic and potential energies of the fluctuating particles calculated for each scenario have been shown to be affected by the water content by focusing on small local areas. Therefore, this study provides a better understanding and new insights regarding intermittent debris flows, and explains the impact of the water content on their formation and movement processes.

Numerical investigation of anguilliform locomotion by the SPH method

2019 ◽  
Vol 30 (1) ◽  
pp. 328-346 ◽  
Author(s):  
Amin Rahmat ◽  
Hossein Nasiri ◽  
Marjan Goodarzi ◽  
Ehsan Heidaryan
Keyword(s):  
Drag Coefficient ◽  
Numerical Investigation ◽  
Sph Method ◽  
Content Type ◽  
Aquatic Locomotion ◽  
Wide Range ◽  
Particle Hydrodynamics ◽  
Dummy Particles ◽  
Smoothed Particle ◽  
Sph Algorithm

Purpose This paper aims to introduce a numerical investigation of aquatic locomotion using the smoothed particle hydrodynamics (SPH) method. Design/methodology/approach To model this problem, a simple improved SPH algorithm is presented that can handle complex geometries using updatable dummy particles. The computational code is validated by solving the flow over a two-dimensional cylinder and comparing its drag coefficient for two different Reynolds numbers with those in the literature. Findings Additionally, the drag coefficient and vortices created behind the aquatic swimmer are quantitatively and qualitatively compared with available credential data. Afterward, the flow over an aquatic swimmer is simulated for a wide range of Reynolds and Strouhal numbers, as well as for the amplitude envelope. Moreover, comprehensive discussions on drag coefficient and vorticity patterns behind the aquatic are made. Originality/value It is found that by increasing both Reynolds and Strouhal numbers separately, the anguilliform motion approaches the self-propulsion condition; however, the vortices show different pattern with these increments.

Numerical Study of Wave Slamming on a Rectangular Slab

2012 ◽  
Vol 204-208 ◽  
pp. 4971-4977
Author(s):  
Ya Mei Lan ◽  
Wen Hua Guo ◽  
Yong Guo Li
Keyword(s):  
Numerical Study ◽  
Navier Stokes ◽  
Governing Equations ◽  
Reflected Waves ◽  
Rans Equations ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Wave Slamming ◽  
Numerical Wave ◽  
Rectangular Slab

The CFD software FLUENT was used as the foundation to develop the numerical wave flume, in which the governing equations are the Reynolds-averaged Navier-Stokes (RANS) equations and the standard k~ε turbulence model. The wave generating and absorbing were introduced into the RANS equations as the source terms using the relaxation approach. A new module of the wave generating and absorbing function, which is suitable for FLUENT based on the volume of fluid method (VOF), was established. Within the numerical wave flume, the reflected waves from the model within the computation domain can be absorbed effectively before second reflection appears due to the wave generating boundary. The computational results of the wave pressures on the bottom of the rectangular slab were validated for the different relative clearance by the experimental data. Good agreements were found.

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