The influence of time scale in free surface flow simulation using Smoothed Particle Hydrodynamics (SPH) (original) (raw)
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International Journal Of Petrochemical Science & Engineering, 2018
The smoothed particles hydrodynamics (SPH) technique has been used to treat some problems occurred in the free surface flow particularly dam-breaking flow using the open-source SPH code through the NAG FORTRAN compiler and the result presentation was done by using the Para view visualization software. Several methods are employed in order to solve the experienced problems. The most important features have been achieved from this work are: the density filtering method is used to treat pressure fluctuation and the operation time has decreased. Moreover, changing the boundary condition has provided two important things; preventing the particles from penetration the walls and also decreasing the operation time even more. Furthermore, changing the smoothing length from the optimum case (h=1.3 Δx) to (h=1.5 Δx), it shows a few pressure fluctuations and an increase in operation time with no wave propagation. The second change is from (h=1.3 Δx) to (h=1.0 Δx) the pressure noise rose a little bit further but the operation time decreased. The third change is from (h=1.3 Δx) to (h=0.5 Δx) which led to increasing the pressure oscillations and the solution accuracy has been decreased. In spite of decreasing the influence radius, the operation time has increased. Finally, there is no difference has been achieved from changing the pressure formulation in the shape of frames except the operation time has reduced.
3D Simulation of Dam-break effect on a Solid Wall using Smoothed Particle Hydrodynamics
Dam is built for water supply, water flow or flooding control and electricity energy storage, but in other hand, dam is one of the most dangerous natural disaster in many countries including in Indonesia. The impact of dam break in neighbour area and is huge and many flooding in remote area, as happen in Dam Situ Gintung in Tangerang (close to Jakarta) in 2009. Smoothed Particle Hydrodynamics (SPH), is one of numerical method based on Lagrangian grid which is ap- plied in astrophysical simulation may be used to solve the simulation on dam break effect. The development of SPH methods become alternative methods to solving Navier Stokes equation, which is main key in fluid dynamic simulation. In this paper, SPH is developed for supporting solid par- ticles in use for 3D dam break effect (3D-DBE) simulation. Solid particle have been treated same as fluid particles with additional calculation for converting gained position became translation and rotation of solid object in a whole body. ...
Dam break Smoothed Particle Hydrodynamic modeling based on Riemann solvers
Advances in Fluid Mechanics VIII, 2010
The Smoothed Particle Hydrodynamic (SPH) method, originally developed during the 1970s to solve astrophysical problems, has shown many attractive features that have led many authors to try to use it to solve fluid flows problems. Its free surfaces tracking capabilities and its straightforward implementation of multi-materials interactions make it well suited for complex flows modeling.
Three-Dimensional Smoothed Particle Hydrodynamics Method for Simulating Free Surface Flows
2013
In this paper, we applied an improved Smoothing Particle Hydrodynamics (SPH) method by using gradient kernel renormalization in three-dimensional cases. The purpose of gradient kernel renormalization is to improve the accuracy of numerical simulation by improving gradient kernel approximation. This method is implemented for simulating free surface flows, in particular dam break case with rigid ball structures and the propagation of waves towards a slope in a rectangular tank.
Comparison between SPH and MPS Methods for Numerical Simulations of Free Surface Flow Problems
Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 2014
In this paper a comparison between two commonly mesh-free Lagrangian particles methods which have the ability to deal with problems with large free surface deformations i.e., weakly compressible smoothed Particle Hydrodynamic (SPH), and the original version of Moving Particle Semi-implicit (MPS) were done. Two benchmark tests, a collapse of a water column with a rigid obstacle, and dam break on a wet bed, are taken into consideration to examine the two methods. The results show that the particles from MPS are scattered and the water surface shape is scratchy, on the contrary the profile of water by SPH is commonly smooth and gentle. One of the advantages of SPH method is found that it yields rather smoother results even if the particles density becomes smaller. The CPU time for the presented cases with SPH is smaller than MPS, even though SPH requires smaller Δt.
International Journal of Engineering, 2019
In this paper, a mesh-free approach called smooth particle hydrodynamics (SPH) is proposed to analyze the seepage problem in porous media. In this method, computational domain is discredited by some nodes, and there is no need for background mesh; therefore, it is a truly meshless method. The method was applied to analyze seepage flow through a concrete dam foundation. Using the SPH method, the computational boundary being coincident with the physical boundary, was numerically acquired by solving seepage flow govern in equations. The numerical results of the presented method were compared with ones calculated by the Geostudio-SEEP\W (finite element based software). T he water head values were calculated through the dam foundation, and there was a good agreement between results. Moreover, results showed that the SPH method is efficient and capable of analyzing seepage flow particularly in complex geometry problems.
An implementation of the SPH method and its application to two-dimensional dam break cases
Ingeniería Investigación y Tecnología
A basic implementation of the weakly compressible smoothed particle hydrodynamics (W-SPH) method is used to model the open surface flow phenomena of two different types of hydraulic problems. They were both two-dimensional approximations of known hydraulics problems: dam break over dry bed and dam break over wet bed with shallow and deep variants. For all models, the results were compared quantitatively with data from waterfront profiles from previously published experiments. A qualitative approach was used to assess the general profile shape comparing the numerical hydraulic profile results with published photographs of all setups shown. The numerical model converged to a stable solution with relatively low-resolution setups (2 000 to 20 000 particles) and a good correlation was found with the experimental and numerical references, even without the application of correction algorithms. Numerical oscillations in the density field did produce small artificial waves and vortices, but ...
Smoothed Particle Hydrodynamics for shallow water flow problems has received some attention since it is an attractive mesh-free, automatically adaptive method without special treatment for wet/dry interfaces. In this paper an algorithm for particle splitting is introduced in order to avoid low resolution at small depths, and a new procedure for discretizing the bed source term in presence of irregular bathymetries is applied. The numerical method is tested against the reference solution for a Cylindrical Dam break over a non-flat bottom. The CADAM and the 2D Dam breaks experimental test are also reproduced in order to show the capability of the numerical method to simulate real phenomena.
Computational Fluid Dynamics - Basic Instruments and Applications in Science, 2018
Today, the use of modern high-performance computing (HPC) systems, such as clusters equipped with graphics processing units (GPUs), allows solving problems with resolutions unthinkable only a decade ago. The demand for high computational power is certainly an issue when simulating free-surface flows. However, taking the advantage of GPU's parallel computing techniques, simulations involving up to 10 9 particles can be achieved. In this framework, this chapter shows some numerical results of typical coastal engineering problems obtained by means of the GPU-based computing servers maintained at the Environmental Physics Laboratory (EPhysLab) from Vigo University in Ourense (Spain) and the Tier-1 Galileo cluster of the Italian computing centre CINECA. The DualSPHysics free package based on smoothed particle hydrodynamics (SPH) technique was used for the purpose. SPH is a meshless particle method based on Lagrangian formulation by which the fluid domain is discretized as a collection of computing fluid particles. Speedup and efficiency of calculations are studied in terms of the initial interparticle distance and by coupling DualSPHysics with a NLSW wave propagation model. Water free-surface elevation, orbital velocities and wave forces are compared with results from experimental campaigns and theoretical solutions.