SPH Simulation of Wave Scattering by a Heaving Submerged Horizontal Plate

2018 ◽  
Vol 01 (02) ◽  
pp. 1840004 ◽  
Author(s):  
Ming He ◽  
Wanhai Xu ◽  
Xifeng Gao ◽  
Bing Ren
Keyword(s):  
Wave Scattering ◽  
Numerical Study ◽  
Horizontal Plate ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Submerged Horizontal Plate ◽  
Wave Blocking ◽  
Sph Simulation ◽  
Wave Induced ◽  
Blocking Mechanism

Liu et al. [Liu, C., Huang, Z. & Chen, W. [2017] “A numerical study of a submerged horizontal heaving plate as a breakwater,” J. Coast. Res.33(4), 917–930.] numerically studied the wave scattering by a heaving submerged horizontal plate (SHP) within the framework of the potential flow theory. They presented the excellent performance of the heaving SHP on wave blocking, because the radiated wave induced by the heave response of plate is likely to neutralize the transmitted wave. As a further study, the present work simulates the wave–heaving SHP interaction using the smoothed particle hydrodynamics, which is widely recognized as a powerful tool for computing complex viscous fluid dynamics. In this way, additional understanding on the wave blocking mechanism of the heaving SHP is contributed. The effect of submergence of plate on the wave and structural dynamics is also investigated. The results show that, under most submergence conditions, a heaving SHP breakwater is more effective than a fixed one. In terms of the limited cases in this research, 17% is proven to be the optimum ratio of submergence to water depth for the heaving SHP breakwater.

scholarly journals SPH Simulation of Hydraulic Jump on Corrugated Riverbeds

2019 ◽  
Vol 9 (3) ◽  
pp. 436 ◽  
Author(s):  
Shenglong Gu ◽  
Fuping Bo ◽  
Min Luo ◽  
Ehsan Kazemi ◽  
Yunyun Zhang ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Dissipation Rate ◽  
Hydraulic Jump ◽  
Numerical Study ◽  
Energy Dissipation Rate ◽  
Vortex Pattern ◽  
Particle Hydrodynamics ◽  
Sph Model ◽  
Smoothed Particle ◽  
Sph Simulation

This paper presents a numerical study of the hydraulic jump on corrugated riverbed using the Smoothed Particle Hydrodynamics (SPH) method. By simulating an experimental benchmark example, the SPH model is demonstrated to predict the wave profile, velocity field, and energy dissipation rate of hydraulic jump with good accuracy. Using the validated SPH model, the dynamic evolvement of the hydraulic jump on corrugated riverbed is studied focusing on the vortex pattern, jump length, water depth after hydraulic jump, and energy dissipation rate. In addition, the influences of corrugation height and length on the characteristics of hydraulic jump are parametrically investigated.

scholarly journals Numerical Study of Binary Trickle Flow of Liquid Iron and Molten Slag in Coke Bed by Smoothed Particle Hydrodynamics

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 221 ◽  
Author(s):  
Shungo Natsui ◽  
Kazui Tonya ◽  
Hiroshi Nogami ◽  
Tatsuya Kikuchi ◽  
Ryosuke O. Suzuki ◽  
...  
Keyword(s):  
Liquid Iron ◽  
Smoothed Particle Hydrodynamics ◽  
Molten Slag ◽  
Numerical Study ◽  
Surface Force ◽  
Attractive Force ◽  
Iron Slag ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Sph Simulation

In the bottom region of blast furnaces during the ironmaking process, the liquid iron and molten slag drip into the coke bed by the action of gravity. In this study, a practical multi-interfacial smoothed particle hydrodynamics (SPH) simulation is carried out to track the complex liquid transient dripping behavior involving two immiscible phases in the coke bed. Numerical simulations were performed for different conditions corresponding to different values of wettability force between molten slag and cokes. The predicted dripping velocity changes and interfacial shape were investigated. The relaxation of the surface force of liquid iron plays a significant role in the dripping rate; i.e., the molten slag on the cokes acts as a lubricant against liquid iron flow. If the attractive force between the coke and slag is smaller than the gravitational force, the slag then drops together with the liquid iron. When the attractive force between the coke and slag becomes dominant, the iron-slag interface will be preferentially detached. These results indicate that transient interface morphology is formed by the balance between the momentum of the melt and the force acting on each interface.

scholarly journals A Numerical Study of Fluid Flow in a Vertical Slot Fishway with the Smoothed Particle Hydrodynamics Method

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1928 ◽  
Author(s):  
Gorazd Novak ◽  
Angelantonio Tafuni ◽  
José M. Domínguez ◽  
Matjaž Četina ◽  
Dušan Žagar
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Numerical Study ◽  
Free Surface Flows ◽  
Open Boundary ◽  
Doppler Velocity ◽  
Vertical Slot ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamics Method ◽  
Vertical Slot Fishway

Fishways have a great ecological importance as they help mitigate the interruptions of fish migration routes. In the present work, the novel DualSPHysics v4.4 solver, based on the smoothed particle hydrodynamics method (SPH), has been applied to perform three-dimensional (3-D) simulations of water flow in a vertical slot fishway (VSF). The model has been successfully calibrated against published field data of flow velocities that were measured with acoustic Doppler velocity probes. A state-of-the-art algorithm for the treatment of open boundary conditions using buffer layers has been applied to accurately reproduce discharges, water elevations, and average velocity profiles (longitudinal and transverse velocities) within the observed pool of the VSF. Results herein indicate that DualSPHysics can be an accurate tool for modeling turbulent subcritical free surface flows similar to those that occur in VSF. A novel relation between the number of fluid particles and the artificial viscosity coefficient has been formulated with a simple logarithmic fit.

scholarly journals Numerical study of rainstorm influence on parachute airdropping based on the smoothed particle hydrodynamics/arbitrary Lagrangian–Eulerian coupling method

2020 ◽  
Vol 15 ◽  
pp. 155892502091561
Author(s):  
Linbo Yan ◽  
Zhengkai Sun ◽  
Han Cheng
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Wind Field ◽  
Numerical Study ◽  
Great Influence ◽  
Coupling Method ◽  
Influential Factor ◽  
Arbitrary Lagrangian Eulerian ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
And Performance

In order to study the influence of rainstorm on parachute dropping, the smoothed particle hydrodynamics/arbitrary Lagrangian–Eulerian coupling method is proposed. Finite elements are used to describe the continuous material such as fabric and air flow field, and the smoothed particle hydrodynamics particles are used to describe the discrete raindrops. The coupling between different fluid and structure is realized by penalty function. In order to distinguish the most influential factor of rainstorm environment on parachute, the effects of raindrop field and wind field in rainstorm are studied, respectively. It could be found that the raindrop fields with different droplet sizes have little effect on the parachute’s shape, opening shock, and performance according to the comparative analysis, while the vertical wind field has a great influence on parachute’s deceleration performance. The wind field, not the raindrop field, is the most important factor affecting the parachute’s deceleration performance. The method and conclusions in this article could provide some references for parachute design.

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