scholarly journals High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs

2009 ◽  
Vol 500 (3) ◽  
pp. 1193-1205 ◽  
Author(s):  
P. Lorén-Aguilar ◽  
J. Isern ◽  
E. García-Berro
Keyword(s):  
High Resolution ◽  
Smoothed Particle Hydrodynamics ◽  
White Dwarfs ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

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 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.

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 Self-gravitating barotropic equilibrium configurations of rotating bodies with smoothed particle hydrodynamics

2020 ◽  
Vol 637 ◽  
pp. A61
Author(s):  
D. García-Senz ◽  
R. M. Cabezón ◽  
J. M. Blanco-Iglesias ◽  
P. Lorén-Aguilar
Keyword(s):  
Accretion Disks ◽  
Differential Rotation ◽  
Smoothed Particle Hydrodynamics ◽  
White Dwarfs ◽  
Initial Conditions ◽  
Relaxation Method ◽  
Equilibrium Configurations ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Rotating Bodies

Context. Self-gravitational rotating bodies do not have spherically symmetric geometries. The study of physical events appearing in fast-spinning compact stars and accretion disks, for example those due to localized thermonuclear ignitions in white dwarfs or to the role played by hydrodynamic instabilities in stars and disks, often requires 3D simulations. When the numerical simulations are carried out with the smoothed particle hydrodynamics (SPH) technique a critical point arises as to how to build a stable initial model with rotation because there is no well-established method for that purpose. Aims. We want to provide a portable, easy-to-implement methodology for SPH simulations to procedurally generate physically sound, stable initial conditions for rotating bodies. Methods. We explain and validate an easy and versatile novel relaxation method to obtain 3D equilibrium configurations of rotating bodies with SPH. As detailed below, this method is able to relax barotropic, P(ρ), structures either in rigid or differential rotation. The relaxation procedure strongly relies on the excellent conservation of angular momentum that characterizes the SPH technique. Results. We applied our proposal to obtain stable rotating structures of single white dwarfs, compact binaries harboring two white dwarfs, high-density stars approached as polytropes and accretion disks either in rigid or differential rotation. Conclusions. We present a novel relaxation method to build 3D rotating structures of barotropic bodies using the SPH technique. The method has been successfully applied to a variety of zero-temperature white dwarfs and polytropic self-gravitating structures. Our SPH results have been validated by comparing the main features (energies, central densities, and the polar-to-equatorial radius ratio) to those obtained with independent grid-based methods, for example, the self-consistent field method, showing that both methods agree within a few percent.

Simulation de l'écoulement au cours du procédé de rotomoulage par la méthode Smoothed Particle Hydrodynamics (SPH)

2008 ◽  
Vol 96 (6) ◽  
pp. 263-268 ◽  
Author(s):  
E. Mounif ◽  
V. Bellenger ◽  
A. Ammar ◽  
R. Ata ◽  
P. Mazabraud ◽  
...  
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle
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