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Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
One of the programs of the Magnetic fusion Energy (MFE) Theory and computations Program is studying the anomalous transport of thermal energy across the field lines in the core of a tokamak. We use the method of gyrokinetic particle-in-cell simulation in this study. For this LDRD project we employed massively parallel processing, new algorithms, and new algorithms, and new formal techniques to improve this research. Specifically, we sought to take steps toward: researching experimentally-relevant parameters in our simulations, learning parallel computing to have as a resource for our group, and achieving a 100 x speedup over our starting-point Cray2 simulation code's performance.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
One of the programs of the Magnetic fusion Energy (MFE) Theory and computations Program is studying the anomalous transport of thermal energy across the field lines in the core of a tokamak. We use the method of gyrokinetic particle-in-cell simulation in this study. For this LDRD project we employed massively parallel processing, new algorithms, and new algorithms, and new formal techniques to improve this research. Specifically, we sought to take steps toward: researching experimentally-relevant parameters in our simulations, learning parallel computing to have as a resource for our group, and achieving a 100 x speedup over our starting-point Cray2 simulation code's performance.
Author: Nina Hanzlikova Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
During 20th century few branches of science have proved themselves to be more industrially applicable than Plasma science and processing. Across a vast range of discharge types and regimes, and through industries spanning semiconductor manufacture, surface sterilisation, food packaging and medicinal treatment, industry continues to find new usefulness in this physical phenomenon well into 21st century. To better cater to this diverse motley of industries there is a need for more detailed and accurate understanding of plasma chemistry and kinetics, which drive the plasma processes central to manufacturing. Extensive efforts have been made to characterise plasma discharges numerically and mathematically leading to the development a number of different approaches. In our work we concentrate on the Particle-In-Cell (PIC) - Monte Carlo Collision (MCC) approach to plasma modelling. This method has for a long time been considered computationally prohibitive by its long run times and high computational resource expense. However, with modern advances in computing, particularly in the form of relatively cheap accelerator devices such as GPUs and co-processors, we have developed a massively parallel simulation in 1 and 2 dimensions to take advantage of this large increase in computing power. Furthermore, we have implemented some changes to the traditional PIC-MCC implementation to provide a more generalised simulation, with greater scalability and smooth transition between low and high (atmospheric) pressure discharge regimes. We also present some preliminary physical and computational benchmarks for our PIC-MCC implementation providing a strong case for validation of our results.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
Gyrokinetic particle-in-cell (PIC) simulations have been proven to be an important and useful tool for studying low frequency waves and instabilities below ion cyclotron frequency. The gyrokinetic formalism eliminates the cyclotron motion by analytically averaging the equation of motion in time, while keeping finite-Larmor radius effects, and therefore allows a time step of integration to be significantly longer than the cyclotron period. At the same time the thermal fluctuation level is reduced well below that of a conventional PIC simulation code. Recent simulations have been performed over a number of wave periods to study nonlinear evolution of drift waves and ion-temperature-gradient modes and the associated transport. With about a quarter million particles and a 64 x 128 x 32 grid in three dimensions, it takes about 100 hours on the Cray-2 single processor to follow the modes to a nonlinear quasi-steady state for relatively strong gradients and strong growth rates. Much more efficient simulations are needed in order to understand these low-frequency waves and the transport associated with them by the use of this tool, and to facilitate the simulation of more weakly unstable plasmas with parameters more relevant to experimental conditions. We have set a goal of achieving an efficiency gain of a factor of 100 on a present-day computer over what has been achieved on the Cray-2 for gyrokinetic simulations. To reach this goal we have begun a project with two components; one is the use of new PIC techniques such as subcycling, orbit-averaging, and semi-implicit algorithms, and the other is the use of massively parallel computers such as the BBN TC200 and the Thinking Machines CM-2. 6 refs.
Author: Sunita Chandrasekaran Publisher: Springer ISBN: 3030122743 Category : Computers Languages : en Pages : 141
Book Description
This book constitutes the refereed post-conference proceedings of the 5th International Workshop on Accelerator Programming Using Directives, WACCPD 2018, held in Dallas, TX, USA, in November 2018. The 6 full papers presented have been carefully reviewed and selected from 12 submissions. The papers share knowledge and experiences to program emerging complex parallel computing systems. They are organized in the following three sections: applications; using openMP; and program evaluation.
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Author: Saleh Hosni Al-Sharaeh
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Author: Nina Hanzlikova
Author: Lawrence Livermore National Laboratory
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Author: Sunita Chandrasekaran