Efficient massively parallel Euler solver for two-dimensional unstructured grids

AIAA Journal ◽  
1992 ◽  
Vol 30 (4) ◽  
pp. 947-952 ◽  
Author(s):  
Steven W. Hammond ◽  
Timothy J. Barth
Keyword(s):  
Unstructured Grids ◽  
Massively Parallel ◽  
Two Dimensional ◽  
Euler Solver

scholarly journals FFT for the APE Parallel Computer

1997 ◽  
Vol 08 (06) ◽  
pp. 1317-1334 ◽  
Author(s):  
Thomas Lippert ◽  
Klaus Schilling ◽  
Sven Trentmann ◽  
Federico Toschi ◽  
Raffaele Tripiccione
Keyword(s):  
Systolic Array ◽  
Parallel Computer ◽  
Massively Parallel ◽  
Two Dimensional ◽  
One Dimensional ◽  
Data Field ◽  
Matrix Transposition ◽  
Neighbor Connectivity ◽  
Parallel Fft ◽  
Parallel Fft Algorithm

We present a parallel FFT algorithm for SIMD systems following the "Transpose Algorithm" approach. The method is based on the assignment of the data field onto a one-dimensional ring of systolic cells. The systolic array can be universally mapped onto any parallel system. In particular for systems with next-neighbor connectivity our method has the potential to improve the efficiency of matrix transposition by use of hyper-systolic communication. We have realized a scalable parallel FFT on the APE100/Quadrics massively parallel computer, where our implementation is part of a two-dimensional hydrodynamics code for turbulence studies.

Dynamic Unstructured Grids Method with Applications to Unsteady Flows Involving Moving Boundaries

2015 ◽  
Vol 757 ◽  
pp. 87-91
Author(s):  
Jun Li Wang ◽  
Dong Sheng Zhang
Keyword(s):  
Unstructured Grids ◽  
Boundary Effect ◽  
Analogy Method ◽  
Torsion Oscillation ◽  
Spring Method ◽  
Euler Solver ◽  
Long Endurance ◽  
Good Agreement ◽  
Rigid Wing

Spring analogy method for dynamic unstructured grids is studied. The stiffness of the springs in the vertex spring method is analyzed. Improvements considering squashing spring effect and boundary effect are developed to the standard method. Applications of the improved spring analogy method to dynamic grids generation show that the new method greatly improves the deforming ability and the quality of the grids. This improved unstructured dynamic mesh method, coupled with ALE Euler solver, is then applied to simulate unsteady transonic flow about harmonious oscillation of rigid wing and bend-torsion oscillation of high-aspect ratio sweepback wing of High-Altitude-Long-Endurance Unmanned Aerial Vehicles; computational results are in good agreement with those of other literatures and experiments

scholarly journals Hydrogenation Dynamics of Biphenylene Carbon (Graphenylene) Membranes

MRS Advances ◽  
2017 ◽  
Vol 2 (29) ◽  
pp. 1571-1576
Author(s):  
Vinicius Splugues ◽  
Pedro Alves da Silva Autreto ◽  
Douglas S. Galvao
Keyword(s):  
Molecular Dynamics ◽  
Large Scale ◽  
Materials Science ◽  
Md Simulations ◽  
Structural Transformations ◽  
Extensive Study ◽  
Massively Parallel ◽  
Porous Membranes ◽  
Two Dimensional ◽  
Reactive Force

ABSTRACTThe advent of graphene created a revolution in materials science. Because of this there is a renewed interest in other carbon-based structures. Graphene is the ultimate (just one atom thick) membrane. It has been proposed that graphene can work as impermeable membrane to standard gases, such argon and helium. Graphene-like porous membranes, but presenting larger porosity and potential selectivity would have many technological applications. Biphenylene carbon (BPC), sometimes called graphenylene, is one of these structures. BPC is a porous two-dimensional (planar) allotrope carbon, with its pores resembling typical sieve cavities and/or some kind of zeolites. In this work, we have investigated the hydrogenation dynamics of BPC membranes under different conditions (hydrogenation plasma density, temperature, etc.). We have carried out an extensive study through fully atomistic molecular dynamics (MD) simulations using the reactive force field ReaxFF, as implemented in the well-known Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) code. Our results show that the BPC hydrogenation processes exhibit very complex patterns and the formation of correlated domains (hydrogenated islands) observed in the case of graphene hydrogenation was also observed here. MD results also show that under hydrogenation BPC structure undergoes a change in its topology, the pores undergoing structural transformations and extensive hydrogenation can produce significant structural damages, with the formation of large defective areas and large structural holes, leading to structural collapse.

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