Surface tension and wetting effects with smoothed particle hydrodynamics
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Particle (ecology)
Volume fraction
Wetting transition
Smoothed Particle Hydrodynamics
Tension (geology)
Abstract A volume of fluid (VOF) method is developed combining a first‐order limited downwind scheme with higher order accurate schemes. The method is characterized by retaining a sharp fluid interface and a reduction in numerical diffusion near the interface, but avoids complicated geometrical reconstruction as occurs in most volume tracing algorithms. To demonstrate the accuracy and robustness of the method, a selection of numerical experiments are presented involving a pure advection problem, a water wave impact caused by a dam breaking and liquid sloshing in a partially filled tank. Copyright © 2011 John Wiley & Sons, Ltd.
Slosh dynamics
Numerical diffusion
Robustness
Tracing
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The Volume of Fluid (VOF) method is a powerful tool for modelling the movement of free surface fluid flows. In this paper, a new VOF advection algorithm is presented, termed the Stream scheme. The algorithm uses a linear piecewise method for free surface reconstruction, coupled to a unique fully multidimensional method of cell boundary flux integration. Comparisons with other VOF advection algorithms show the performance of the new scheme to be good.
Free surface
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Smoothed Particle Hydrodynamics
Geomechanics
Effective stress
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Smoothed Particle Hydrodynamics
Particle (ecology)
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이 논문에서는 조류충돌로 인한 항공기 플랩 구동부의 안정성 분석 방법을 소개한다. 정확한 해석을 위해 실제 조류 형상을 이용한 SPH(Smoothed Particle Hydrodynamics) 모델링과 SPH 매개변수의 최적화를 진행하였고, 이어서 최대 변형률 에너지 기반으로 플랩의 구동부에 가장 취약한 상황을 조사하였다. 일반적으로 간단한 조류 형상을 이용한 조류충돌을 위한 SPH 해석은 실제 실험 결과와 비교할 때 정확성에 한계가 있었다. 본 연구에서는 충돌 부위의 변위 및 응력뿐 아니라 보다 실제적인 조류 형상 SPH 모델을 사용하여 플랩 구동부의 응력 및 소성 변형도 분석하였다.
Smoothed Particle Hydrodynamics
Particle (ecology)
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Abstract The present study deals with the analysis of stochastic transient pressure variations and wall impacts for scaled down models of LNG carriers by using the VOF technique for interface characterization. Numerical simulation of sloshing under sway using multiphase liquid-gas condition has been carried out. Use of VOF method for multiphase numerical simulation is compared with the results of previously performed SPH study and established sloshing experiments. The efficacies of the VOF interface capturing technique is established by comparison with high-resolution images taken during sloshing experiments performed under the same external excitation frequency, amplitude and fill level. The pressure data from experiments when compared with respective simulations involving SPH and VOF methods helps to capture the fluid flow behaviour and intricacies they can handle.
Slosh dynamics
Multiphase flow
Transient (computer programming)
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The smoothed particle hydrodynamics(SPH) method is applied to solving the shallow water equation of the one-dimensional dam-break problem.To remedy deficiency of the SPH method in dealing with boundary conditions,the virtual particle method is introduced for processing boundary conditions.Compared with the results in related literature by other methods,the curve obtained by the SPH method is sharper in the discontinuous place and smoother in other places,which shows that the SPH method can capture the shock wave well and is accurate.
Smoothed Particle Hydrodynamics
Particle method
Shallow water equations
Particle (ecology)
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In this article, a two-phase flow algorithm that uses an explicit Adams–Bashforth scheme coupled with volume of fluid (VOF) method in a uniform staggered Cartesian grid for surface tension dominant simulation is presented. The interface reconstruction procedure is implemented using the Weighed Linear Interface Calculation (WLIC) algorithm. The level set (LS) function instead of VOF function is adopted for calculation of not only the interface normal vectors in the WLIC algorithm but also the surface tension terms in the Navier–Stokes equations. This VOF method is compared with LS method and other experiment results in the literature for vortex deforming, milk crown, droplet impacting into deep liquid pool and bubble bursting at a free surface problems to show whether mass can be well conserved and breaking and merging phenomena can be accurately simulated.
Level set method
Free surface
Interface (matter)
Marching cubes
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Smoothed Particle Hydrodynamics (SPH) is a meshfree (particle) method that was firstly proposed for astrophysics application. Nowadays, after the efforts in last two decades, it has been gradually extended to the research of cutting process. This review paper aims at presenting a comprehensive review of the modelling and simulation of cutting process using SPH method. It introduces the basic theory of SPH and its adoption for cutting process simulation. The key focus of the paper is on the gain of understanding of cutting mechanism by the aid of SPH method. Research challenges and recommendations for future works are also summarized.
Smoothed Particle Hydrodynamics
Meshfree methods
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The continuum surface force(CSF)model for surface tension,which is employed in the traditional smoothed particle hydrodynamics(SPH) method,is very low accurate when handling the problem with large deformation and surface tension.The reason is that the deficiency of particles near the boundary and sharp-angled areas,and it caused large error of curvature calculation in the traditional SPH method.In this paper modified equations for surface tension were derived by modifying normal and curvature with corrective smoothed particle method(CSPM).It was based on the SPH method with surface tension proposed by Morris.Formation of an oil drop under surface tension from initial square shape in water was simulated with the new method.Simultaneous, two-dimensional simulation of breaking up process of two colliding oil drops in water under surface tension was also simulated.
Smoothed Particle Hydrodynamics
Tension (geology)
Particle (ecology)
Capillary length
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