High Resolution 3D Simulation of Melt Jet Breakup Phenomenon Using Multi-GPU-Based Smoothed Particle Hydrodynamics Code and Comparison With Experimental Result

2021 ◽  
Author(s):  
So-Hyun Park ◽  
Eung Soo Kim ◽  
Young Beom Jo
Keyword(s):  
High Resolution ◽  
Smoothed Particle Hydrodynamics ◽  
3D Simulation ◽  
Experimental Result ◽  
Jet Breakup ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

High Resolution 3D Simulation of Melt Jet Breakup Phenomenon Using Multi-GPU-Based Smoothed Particle Hydrodynamics Code and Comparison With Experimental Result

2020 ◽  
Author(s):  
So-Hyun Park ◽  
Young Beom Jo ◽  
Eung Soo Kim
Keyword(s):  
High Resolution ◽  
Smoothed Particle Hydrodynamics ◽  
Large Scale ◽  
Three Dimensions ◽  
Severe Accident ◽  
Experimental Result ◽  
Jet Breakup ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Break Up

Abstract Fuel Coolant Interaction (FCI), one of the critical phenomena in severe accident, involves a variety of physical phenomena including the interaction between coolant and fuel of high temperature. Especially, the jet break-up of a pre-mixing phase that the bulk of molten fuel breaks into the droplet is important for the accident progression. Understanding the intricate physics of jet break-up is essential to reduce the uncertainties of FCI and to mitigate severe accident. In this study, we have developed Lagrangian-based CFD code (named as SOPHIA) using Smoothed Particle Hydrodynamics (SPH) method, which has an advantage on handling the complicated interfacial behaviors, large deformation and multiphase flow. Furthermore, the SOPHIA code is parallelized on the multi-GPUs to achieve high-resolution and large-scale simulation that enhance the accuracy and practical applicability. Using the multi-GPU based SOPHIA code, this study simulates the benchmark jet breakup experiments in high resolution and three dimensions. The simulation results are compared with the experimental data both qualitatively and quantitatively. As a results, they shows a good agreement, and furthermore, three dimensional high resolution simulation is confirmed to resolve the physical features of jet breakup accurately by taking account into the multi-fluids interactions between jet-pool-air.

scholarly journals Shock-induced star cluster formation in colliding galaxies

2010 ◽  
Vol 6 (S270) ◽  
pp. 483-486 ◽  
Author(s):  
Takayuki R. Saitoh ◽  
Hiroshi Daisaka ◽  
Eiichiro Kokubo ◽  
Junichiro Makino ◽  
Takashi Okamoto ◽  
...  
Keyword(s):  
High Resolution ◽  
Shock Compression ◽  
Smoothed Particle Hydrodynamics ◽  
Formation Process ◽  
Cluster Formation ◽  
Star Clusters ◽  
Star Cluster ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Number Of Particles

AbstractWe studied the formation process of star clusters using high-resolutionN-body/smoothed particle hydrodynamics simulations of colliding galaxies. The total number of particles is 1.2×108for our high resolution run. The gravitational softening is 5 pc and we allow gas to cool down to ~10 K. During the first encounter of the collision, a giant filament consists of cold and dense gas found between the progenitors by shock compression. A vigorous starburst took place in the filament, resulting in the formation of star clusters. The mass of these star clusters ranges from 105−8M⊙. These star clusters formed hierarchically: at first small star clusters formed, and then they merged via gravity, resulting in larger star clusters.

Shock Analysis of Underwater Explosion Using Smoothed Particle Hydrodynamics

2004 ◽  
Author(s):  
S. Matsumoto ◽  
S. Itoh
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Underwater Explosion ◽  
Experimental Result ◽  
Governing Equations ◽  
Detonation Products ◽  
Sph Method ◽  
Equation Of States ◽  
Cylindrical Coordinate ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

A blasting process includes large deformations and inhomogeneities caused by shock waves as well as the detonation gases generated by explosives. Smoothed Particle Hydrodynamics (SPH) is a meshless and complete Lagrangian method. The properties of SPH method can overcome the difficulty of a simulation in a blasting process. In this study, the simulation of an underwater explosion using SEP (Safety Explosives) as a cylindrical high explosive is carried out to confirm the advantage of SPH method for the analysis in a blasting process. The Euler equations are used for the governing equations of both water and the detonation products of the explosive. The Jones-Wilkins-Lee (JWL) equation and the Mie-Gru¨neisen equation are used as the equation of states for the detonation products and water, respectively. The two-dimensional and axisymmetrical simulation in cylindrical coordinate system is adopted to analyze the underwater explosion. The simulation result is compared with the experimental result and shows that SPH method can well simulate the underwater explosion.

scholarly journals High-resolution Smoothed Particle Hydrodynamics simulations of the colaescence of double white dwarfs

2009 ◽  
Author(s):  
P. Lorén-Aguilar ◽  
J. Isern ◽  
E. García-Berro ◽  
Kerstin E. Kunze ◽  
Marc Mars ◽  
...  
Keyword(s):  
High Resolution ◽  
Smoothed Particle Hydrodynamics ◽  
White Dwarfs ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals Multiphase simulation of liquid jet breakup using smoothed particle hydrodynamics

2017 ◽  
Vol 28 (04) ◽  
pp. 1750054 ◽  
Author(s):  
Majid Pourabdian ◽  
Pourya Omidvar ◽  
Mohammad Reza Morad
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Multiphase Flows ◽  
Numerical Solutions ◽  
Kernel Functions ◽  
Liquid Jet ◽  
Two Phase ◽  
Breakup Length ◽  
Jet Breakup ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

This paper deals with numerical modeling of two-phase liquid jet breakup using the smoothed particle hydrodynamics (SPH) method. Simulation of multiphase flows involving fluids with a high-density ratio causes large pressure gradients at the interface and subsequently divergence of numerical solutions. A modified procedure extended by Monaghan and Rafiee is employed to stabilize the sharp interface between the fluids. Various test cases such as Rayleigh–Taylor instability, two-phase still water and air bubble rising in water have been conducted, by which the capability of accurately capturing the physics of multiphase flows is verified. The results of these simulations are in a good agreement with analytical and previous numerical solutions. Finally, the simulation of the breakup process of liquid jet into surrounding air is accomplished. The whole numerical solutions are accomplished for both Wendland and cubic spline kernel functions and Wendland kernel function gave more accurate results. Length of liquid breakup in Rayleigh regime is calculated for various flow conditions such as different Reynolds and Weber numbers. The results of breakup length demonstrate in satisfactory agreement with the experimental correlation. Finally, impinging distance and breakup length of a simple multijet setup are analyzed. The two-jet multijet has a longer breakup length than a three-jet one.

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