A la mos NATIONAL LABORATORY Quiet direct simulation of plasmas
نویسندگان
چکیده
A new approach to particle simulation, called “quiet direct simulation Monte Carlo” (QDSMC) , is described that can be applied to many problems of interest, including hydrodynamics, MHD simulation and the,modeling of plasmas with arbitrary and arbitrarily varying collisionality. The essence of QDSMC ’ is the use of carefully chosen weights for the particles (e.g., Gauss-Hermite, for Maxwellian distributions), which are destroyed each time step after the particle information is deposited onto the grid and reconstructed at the beginning of the next time step. The method overcomes the limited dynamical range and excessive statistical noise typically found in particle simulations. In this paper QDSMC is applied to hydrodynamics and MHD test problems, and its suitability for modeling semi-collisional plasma dynamics is considered.
منابع مشابه
Purification et concentrations des plasmas antitoxiques. 1 - Historique, techniques industrielles et choix de la méthode adoptee en Iran
متن کامل
Singularity-free interpretation of the thermodynamics of supercooled water.
Srikanth Sastry,* Pablo G. Debenedetti, Francesco Sciortino, and H. E. Stanley Physical Sciences Laboratory, Division of Computer Research and Technology, National Institutes of Health, Bethesda, Maryland 20952 Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544 Dipartimento di Fisica, Universitá di Roma La Sapienza and Istituto Nazionale per la Fisica della Ma...
متن کاملEffect of Cross-Field Drifts and Core Rotation on Flows in the Main Scrape-Off Layer of DIII-D L-mode Plasmas
1) Lawrence Livermore National Laboratory, Livermore, California 94550, USA 2) University of California San Diego, La Jolla, California 92093, USA 3) General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA 4) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 5) Sandia National Laboratory, Albuquerque, New Mexico 94551, USA 6) University of California Los Angeles, Cal...
متن کاملKinetic Simulation of Collisional Magnetized Plasmas with Semi-Implicit Time Integration
Plasmas with varying collisionalities occur in many applications, such as tokamak edge regions, where the flows are characterized by significant variations in density and temperature. While a kinetic model is necessary for weakly-collisional high-temperature plasmas, high collisionality in colder regions render the equations numerically stiff due to disparate time scales. In this paper, we prop...
متن کاملLupus anticoagulant (LA) testing: performance of clinical laboratories assessed by a national survey using lyophilized affinity-purified immunoglobulin with LA activity.
BACKGROUND Lupus anticoagulant (LA) screens are frequently ordered in the workup of thrombophilic patients or women with fetal loss. The sensitivity and specificity of LA detection vary depending on the choice of tests, cutoff values, and results interpretation. This variation is detrimental to patient management because persistent LA positivity in patients with a history of thrombosis is a req...
متن کامل