Numerical simulation of near-Alfven MHD flows relaxation with a longitudinal magnetic field

2015 ◽  
Vol 81 (3) ◽  
Author(s):  
Evgeniy V. Styopin
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Longitudinal Magnetic Field ◽  
Relaxation Processes ◽  
Plasma Velocity ◽  
Opposite Inequality ◽  
Magnetohydrodynamic Flows ◽  
Longitudinal Plasma ◽  
Nozzle Type ◽  
Alfven Velocity

Stationary magnetohydrodynamics flows in nozzle-type channels in the presence of a longitudinal magnetic field are divided into three significantly different classes: super-Alfven flows in which the longitudinal plasma velocity is higher than the Alfven velocity calculated by a longitudinal magnetic field, sub-Alfven flows – with the opposite inequality, and Alfven flows in which the longitudinal plasma velocity coincides with the Alfven velocity over the entire length of the channel and the plasma density has a constant value. In the present work, stationary Alfven and close to Alfven magnetohydrodynamic flows obtained by using a numerical modeling of their relaxation processes in coaxial channels in the presence of a longitudinal magnetic field are considered.

On the evolution of normal ionizing shock waves in helium

1982 ◽  
Vol 28 (1) ◽  
pp. 53-63 ◽  
Author(s):  
V. S. Synakh ◽  
V. V. Zakajdakov
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Shock Waves ◽  
Longitudinal Magnetic Field ◽  
One Dimensional ◽  
Generation Structure ◽  
Mhd Shock Waves ◽  
Further Development ◽  
Kinetics Of ◽  
Normal Magnetic Field

The generation, structure and propagation of one-dimensional ionizing MHD shock waves in helium under a pressure of 100 mTorr are investigated with the help of numerical simulation. The normal magnetic field varies within 3 to 10 kG and the longitudinal magnetic field varies up to 2·5 kG. The model includes the kinetics of ionization and photo-processes. If a solid conducting piston is a source of perturbation, it may give rise to generation and further development of an MHD switch-on wave. Its evolution at an advanced stage depends weakly on the source. The curves for the dependence of the shock speed on time and the driving magnetic field as well as the profiles for the main quantities are presented. A possibility of comparison with real experiments is discussed. Algorithms based on Godunov's sliding meshes and the imbedding methods are used for numerical simulation.

Numerical Simulation of MIG Welding Arc with Longitudinal Magnetic Field

2011 ◽  
Vol 704-705 ◽  
pp. 668-673 ◽  
Author(s):  
Qi Wei Wang ◽  
Sheng Zhu ◽  
Feng Liang Yin ◽  
Yuan Yuan Liang ◽  
Xiao Ming Wang
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Current Density ◽  
Longitudinal Magnetic Field ◽  
Welding Process ◽  
Three Dimensions ◽  
Anode Surface ◽  
Mig Welding ◽  
Welding Arc ◽  
Arc Pressure

In the study three dimensions finite element mathematical model of MIG welding with longitudinal magnetic field was established. By ANSYS FEA software the temperature and other physical characteristics of the arc were obtained including the distributions of current density and arc pressure on the anode surface. The simulated results show that when the additional longitudinal magnetic field was introduced into welding process, the temperature of arc decreased remarkably and peak value of temperature changed from 16 950K to 13 700K at a welding current of 120A. Under the action of longitudinal magnetic field, on the one hand, heat flux density and current density at the anode surface decrease in the arc core and rise at the edge of arc, on the other hand, arc pressure decrease and arc potential increase. Keywords: Numerical simulation; MIG welding arc; magnetic field

Numerical Simulation of SAW Heat Source in the External Longitudinal Magnetic Field in 16Mn Steel

2013 ◽  
Vol 762 ◽  
pp. 584-589 ◽  
Author(s):  
Yun Long Chang ◽  
Lin Lu ◽  
Xiao Long Liu ◽  
Bo Young Lee
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Finite Element ◽  
Heat Source ◽  
Longitudinal Magnetic Field ◽  
Assembly Language ◽  
Low Frequency ◽  
Element Model ◽  
Element Analysis ◽  
Weld Bead Formation

The finite element analysis on temperature field and stress field during submerged-arc welding (SAW) was carried out by means of assembly language of FORTRAN on the base of ABAQUS. A finite element model was established to study the effects on weld bead formation by using longitudinal magnetic field of low-frequency and different process parameters loaded with moving heat source. A practical SAW experiment was conducted to verify the results of the numerical simulation. It was shown that a molten pool with a wider weld face and a lower penetration could be obtained by the control of longitudinal magnetic field of low-frequency. In addition, the fusion line after this treatment was smoother than with conventional SAW. The results of practical SAW experiment were consistent with those of the numerical simulation. It was confirmed that the longitudinal magnetic field of low-frequency could contribute in diminishing the dilution rate and improving the performance of surfacing layers.

Refinement of metal structure in arc surfacing under the effect of longitudinal magnetic field

2019 ◽  
Vol 2019 (2) ◽  
pp. 19-21
Author(s):  
A.D. Razmyshlyaev ◽  
◽  
M.V. Ageeva ◽  
E.V. Lavrova ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Metal Structure
Sign in / Sign up

Export Citation Format

Share Document