3D SPH Numerical Investigation for the Sloshing Impact in LNG Tank

2013 ◽  
Author(s):  
Zhigang Bai ◽  
Jun Zhao ◽  
Wei Zhang ◽  
Weiling Wang
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Numerical Technique ◽  
Three Dimensional ◽  
Liquid Sloshing ◽  
Dynamic Responses ◽  
Sph Method ◽  
Sph Model ◽  
Lng Tank ◽  
Liquid Natural Gas

Sloshing in liquid natural gas (LNG) tankers includes extremely large deformations of the free surface. To better understand such deformations, a three-dimensional Smoothed Particle Hydrodynamics (SPH) method is developed to analyze the dynamic responses of liquid sloshing in LNG tank. The numerical model solves the Euler equation in the SPH style, the Monaghan-type artificial viscosity has been used in the current SPH model, sloshing wall boundaries were treated by improved coupling boundary pressure treatment. The numerical model is first validated against experimental data for two-dimensional and three-dimensional liquid sloshing in a LNG tank, it shows a fair agreement of overall fluid motions and hydrodynamic pressures. The fields of 3D sloshing pressure and velocity are compared for one period. Finally, the model is used to study 3D liquid sloshing in a tank with vertical baffles. The effect of the baffle on pressure and velocity is investigated and discussed. It shows that the SPH method is a natural numerical technique for coupled fluid-structure problems with large free-surface deformations.

Three-dimensional numerical model for open-channels with free-surface variations

2003 ◽  
Vol 41 (1) ◽  
pp. 110-112
Author(s):  
ZhixiaN. Cao ◽  
Rodney Day ◽  
Sarah Liriano
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Three Dimensional ◽  
Open Channels

Mitigation of liquid sloshing in a rectangular tank due to slotted porous screen

2020 ◽  
Vol 234 (3) ◽  
pp. 686-698
Author(s):  
Sunny Kumar Poguluri ◽  
Il-Hyoung Cho
Keyword(s):  
Free Surface ◽  
Numerical Technique ◽  
Liquid Sloshing ◽  
Tank Wall ◽  
Air Entrapment ◽  
Jet Formation ◽  
Induced Motion ◽  
Free Surface Wave ◽  
Nonlinear Free Surface ◽  
Porous Screen

Liquid sloshing inside a tank with a slotted porous screen at the center is studied based on numerical and experimental methods. Slotted screens with three different porosities (0.0964, 0.1968 and 0.3022) for two submergence depths of 1 and 2 cm have been considered. One of the main advantages of the slotted screens is that the resonance frequency of the sloshing tank can be altered and the sloshing-induced motion/load can be suppressed by energy dissipation across the porous screen. The complexities of slotted screens equipped in a sloshing tank are accompanied by wave breaking, jet formation and liquid fragmentations which are commonly seen phenomena across the porous screen. These violent free surface behaviors in a tank are studied based on numerical simulations using the incompressible turbulent model and compared with the experiments. For the numerical sloshing tank with porous screen, free surface elevation and pressure at the tank wall are in good agreement with the experimental results. The adopted numerical technique will be able to capture the nonlinear free surface wave profile, air entrapment and jet formation across the screen in agreement with the experiments. For the fully submerged screen, the lowest resonance period shifted slightly to higher values. The sloshing tank equipped with porous screen of 0.1968 for the fully submerged screen predicted lower values of the amplification factor and pressure at the tank wall compared to other cases.

scholarly journals Three dimensional numerical simulations for non-breaking solitary wave interacting with a group of slender vertical cylinders

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Weihua Mo ◽  
Philip L.-F. Liu
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Dynamic Pressure ◽  
Laboratory Data ◽  
Three Dimensional ◽  
Time History ◽  
Surface Displacement ◽  
Numerical Results ◽  
Finite Volume Scheme ◽  
Free Surface Displacement

AbstractIn this paper we validate a numerical model for-structure interaction by comparing numerical results with laboratory data. The numerical model is based on the Navier-Stokes(N-S) equations for an incompressible fluid. The N-S equations are solved by two-step projection finite volume scheme and the free surface displacements are tracked by the slender vertical piles. Numerical results are compared with the laboratory data and very good agreement is observed for the time history of free surface displacement, fluid particle velocity and force. The agreement for dynamic pressure on the cylinder is less satisfactory, which is primarily caused by instrument errors.

scholarly journals TRIDIMENSIONAL NUMERICAL MODEL FOR TIDAL AND WIND GENERATED FLOW

1982 ◽  
Vol 1 (18) ◽  
pp. 41
Author(s):  
M.C. Burg ◽  
A. Marluzel ◽  
Y. Coeffe
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Numerical Model ◽  
Finite Difference Method ◽  
Vertical Profile ◽  
Three Dimensional ◽  
Mixing Length ◽  
Gironde Estuary ◽  
Laboratory Flume ◽  
Prismatic Channel

This report presents a three-dimensional numerical model, which calculates by a finite-difference method the vertical profile of horizontal velocities. The unsteady three-dimensional Navier-Stok.es equations with a free surface are governing this flow. We assume a hydrostatic pressure, and simulate the turbulent effects by the Prandtl's mixing-length hypothesis. The model is validated by experiments carried out in a laboratory flume with a prismatic channel inclined 45° over the flow. Then, the model is applied successfully in Gironde estuary and coastal areas in France for the computation of tidal and wind generated currents.

SPH Method Applications for Coastal Wave Breaking and Wave-Structure Interaction

2012 ◽  
Vol 256-259 ◽  
pp. 1990-1993
Author(s):  
Zhi Gang Bai ◽  
Jun Zhao
Keyword(s):  
Wave Breaking ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Wave Structure ◽  
Navier Stokes ◽  
Sph Method ◽  
Structure Interaction ◽  
Promising Tool ◽  
Sph Model ◽  
Wave Structure Interaction

The Smoothed Particle Hydrodynamics (SPH) method is a mesh-free Lagrangian approach which is capable of tracking the large deformations of the free surface with good accuracy. A three-dimensional SPH model was proposed to simulate the wave–structure interaction (WSI), in which a weakly compressible SPH model was introduced to investigate the wave breaking and coastal structure. To validate the SPH numerical model, three different types of wave breaking, namely, spilling, plunging and surging breaking were successfully simulated. The computations were compared with the experimental data and a good agreement was observed. The hydrodynamics model of interaction between wave and structure was established according to Navier-Stokes equations in SPH style. And the model was used in simulating the interaction between wave and a series of new type breakwaters. It is proven to be a promising tool and able to provide reliable prediction on the wave-structure interaction in coastal engineering.

scholarly journals Numerical Simulation of Wind-Driven Circulation in a Thermally Stratified Flow

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Jin Woo Lee ◽  
He-Rin Cho ◽  
Yong-Sik Cho
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Environmental Pollutants ◽  
Three Dimensional ◽  
Internal Flow ◽  
Stratified Flow ◽  
Vertical Circulation ◽  
Rectangular Basin ◽  
Closed Water ◽  
Wind Driven Circulation

The closed water bodies, such as reservoirs and lakes, can be polluted by an inflow of pollutants in the upstream as well as a stratification caused by seasonal natural phenomena. The vertical circulation particularly plays an important role in reducing environmental pollutants. The factors of the vertical circulation are the temperature, wind, thermal diffusivity, sunlight, and so on. The wind is the most significant factor among all possible factors causing the vertical circulation. Thus, it is necessary to describe the validation and application of a three-dimensional numerical model of wind-driven circulation in a thermally stratified flow. In this study, the numerical model is conducted in three steps to calculate the velocity components from the momentum equations inx- andy-directions, the elevations from the free surface equation, and the temperature from the scalar transport equation. The present model was applied to two tests for verification of the numerical accuracy. Numerical results are compared with analytical solutions of the sloshing free surface movement in a rectangular basin and the model is applied to the circulation for the wind-driven flow in a thermal stratification. Consequently, the developed model is validated by two verifications and phenomena of the internal flow.

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