TITLE

A comparison of fluid and kinetic models of steady magnetic reconnection

AUTHOR(S)
Brackbill, J. U.
PUB. DATE
March 2011
SOURCE
Physics of Plasmas;Mar2011, Vol. 18 Issue 3, p032309
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
For steady magnetic reconnection in a current sheet, a two-fluid model that includes tensor pressure is compared with kinetic simulations. The kinetic simulations model a Harris sheet in two dimensions with prescribed inflow and free outflow. The two-fluid model provides solutions along the symmetry line from the inflow boundary to the flow stagnation point. The model assumes incompressibility and neglects the Hall current. Profiles from the inflow boundary to the X-point of the out-of-plane electric field and the terms in Ohm's law that contribute to it from the simulation and from the fluid model agree in almost every detail. The best agreement is obtained when relaxation of the tensor pressure to isotropy occurs on time scales comparable to the electron plasma period. On ion scales, the two-fluid and kinetic simulations give similar results when finite Larmor radius physics is included. The ion pressure relaxation scales linearly with the ion/electron mass ratio.
ACCESSION #
59744081

 

Related Articles

  • Three-dimensional simulation of the self-oscillating flow and side-loads in an over-expanded subscale rocket nozzle Moríñigo, J A; Salvá, J J // Proceedings of the Institution of Mechanical Engineers -- Part G;Oct2006, Vol. 220 Issue 5, p507 

    Time-accurate three-dimensional Reynolds-averaged Navier-Stokes simulations have been performed to explore the flow unsteadiness of the subscale J-2S thrust optimized contour rocket nozzle in over-expansion at prescribed air supply conditions in the chamber. The results show the development of...

  • Magnetic effect on instability and nonlinear stability of double-diffusive convection in a reacting fluid. Harfash, A. // Continuum Mechanics & Thermodynamics;Jan2013, Vol. 25 Issue 1, p89 

    We study the problem of double-diffusive convection in a reacting fluid with a concentration and magnetic field effect-based internal heat source. A linear instability analysis and nonlinear stability analysis are performed, and using the finite element method of p order, we get the numerical...

  • Finite Element Solution of MHD Transient Flow past an Impulsively Started Infinite Horizontal Porous Plate in a Rotating Fluid with Hall Current. Rao, J. Anand; Raju, R. Srinivasa; Sivaiah, S. // Journal of Applied Fluid Mechanics;Jul2012, Vol. 5 Issue 3, p105 

    The problem of a transient three dimensional MHD flow of an electrically conducting viscous incompressible rotating fluid past an impulsively started infinite horizontal porous plate taking into account the Hall current is presented. It is assumed that the fluid rotates with a constant angular...

  • Experimental studies and numerical model validation of overflowing 2D foam to test flotation cell crowder designs. Cole, K. E.; Brito-Parada, P. R.; Xu, C.; Neethling, S. J.; Cilliers, J. J. // Chemical Engineering Research & Design: Transactions of the Inst;Dec2012, Vol. 90 Issue 12, p2196 

    A computational fluid dynamics model of froth motion has been developed to assess different flotation cell designs. This work presents an implementation of the model in a 2D case, to compare the simulated bubble velocity distribution and streamlines to an experimental foaming system. The model...

  • Analysis of Water Flow Pressure on Bridge Piers considering the Impact Effect. Wang, Yin-hui; Zou, Yi-song; Xu, Lue-qin; Luo, Zheng // Mathematical Problems in Engineering;5/19/2015, Vol. 2015, p1 

    In order to investigate the effects of water current impact and fluid-structure interaction on the bridge piers, the mechanism of water flow impact on the bridge pier is firstly studied. Then a finite element model of a bridge pier is established including the effects of water flow impact as...

  • Slots Geometry Influence on the Air gap Magnetic Field Distribution. ZAGHDOUD, BELLAL; SAADOUN, ABDALLAH // WSEAS Transactions on Circuits & Systems;Dec2013, Vol. 12 Issue 12, p361 

    Prediction and performance analysis of electrical machines depend mainly on the accuracy in the evaluation of the magnetic field linking the different parts of the machine. This paper presents the influence of the slots geometry on permanent magnet synchronous machine (PMSM) magnetic field...

  • Design and Analysis of an Interior Continuous Magnetic Gear Box Using Finite Element Method. Majidi, Behrooz; Milimonfared, Jafar // Applied Computational Electromagnetics Society Journal;Jan2015, Vol. 30 Issue 1, p109 

    Magnetic gears offer important potential benefits compared with mechanical gears such as reduced maintenance, improved reliability, inherent overload protection, and physical isolation between the input and output shafts. This paper presents the design and analysis of a novel structure of magnet...

  • Comparison of Three Analytical Methods for the Precise Calculation of Cogging Torque and Torque Ripple in Axial Flux PM Machines. Hemeida, Ahmed; Hannon, Bert; Vansompel, Hendrik; Sergeant, Peter // Mathematical Problems in Engineering;10/31/2016, p1 

    A comparison between different analytical and finite-element (FE) tools for the computation of cogging torque and torque ripple in axial flux permanent-magnet synchronous machines is made. 2D and 3D FE models are the most accurate for the computation of cogging torque and torque ripple. However,...

  • Finite element analyses of flow in a cavity with internal blockages. Fawehinmi, O B; Gaskell, P H; Thompson, H M // Proceedings of the Institution of Mechanical Engineers -- Part C;May2002, Vol. 216 Issue 5, p517 

    Abstract: Although studies of flows in cavities without internal blockages are extremely common, those in which blockages arise are correspondingly rare. The present work describes a numerical study of one such flow using two complementary finite element approximations to the governing...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics