Numerical study of transition to supersonic flows in the edge plasma

2014 ◽  
Vol 21 (7) ◽  
pp. 072510 ◽  
Author(s):  
Rajiv Goswami ◽  
Jean-François Artaud ◽  
Frédéric Imbeaux ◽  
Predhiman Kaw
Keyword(s):  
Numerical Study ◽  
Supersonic Flows ◽  
Edge Plasma

Numerical study of hydrogen jet flames in supersonic flows - Effect of shock waves

1998 ◽  
Author(s):  
J.-H. Kim ◽  
Y. Yoon ◽  
J.-Y. Choi ◽  
I.-S. Jeung
Keyword(s):  
Shock Waves ◽  
Numerical Study ◽  
Supersonic Flows ◽  
Jet Flames

scholarly journals How can vorticity be produced in irrotationally forced flows?

2010 ◽  
Vol 6 (S274) ◽  
pp. 373-375
Author(s):  
Fabio Del Sordo ◽  
Axel Brandenburg
Keyword(s):  
Viscous Fluid ◽  
Interstellar Medium ◽  
Numerical Study ◽  
Supersonic Flows ◽  
First Approximation

AbstractA spherical hydrodynamical expansion flow can be described as the gradient of a potential. In that case no vorticity should be produced, but several additional mechanisms can drive its production. Here we analyze the effects of baroclinicity, rotation and shear in the case of a viscous fluid. Those flows resemble what happens in the interstellar medium. In fact in this astrophysical environment supernovae explosion are the dominant flows and, in a first approximation, they can be seen as spherical. One of the main difference is that in our numerical study we examine only weakly supersonic flows, while supernovae explosions are strongly supersonic.

Transition to supersonic flows in the edge plasma

2011 ◽  
Vol 53 (5) ◽  
pp. 054019 ◽  
Author(s):  
Ph Ghendrih ◽  
K Bodi ◽  
H Bufferand ◽  
G Chiavassa ◽  
G Ciraolo ◽  
...  
Keyword(s):  
Supersonic Flows ◽  
Edge Plasma

scholarly journals Numerical study on supersonic flows of gas-liquid particle mixtures in a De Laval nozzle.

1989 ◽  
Vol 29 (11) ◽  
pp. 911-918 ◽  
Author(s):  
Natsuo Hatta ◽  
Hitoshi Fujimoto ◽  
Ryuji Ishii ◽  
Yoshikuni Umeda ◽  
Jun-ichi Kokado
Keyword(s):  
Laval Nozzle ◽  
Numerical Study ◽  
Supersonic Flows ◽  
Liquid Particle ◽  
De Laval Nozzle

scholarly journals Analytical and numerical study of the transverse Kelvin–Helmholtz instability in tokamak edge plasmas

2016 ◽  
Vol 82 (2) ◽  
Author(s):  
J. R. Myra ◽  
D. A. D’Ippolito ◽  
D. A. Russell ◽  
M. V. Umansky ◽  
D. A. Baver
Keyword(s):  
Numerical Study ◽  
Edge Plasma ◽  
Scaling Analysis ◽  
Density Gradients ◽  
Analytic Model ◽  
Pressure Gradients ◽  
Slab Geometry ◽  
Open Field Line ◽  
Edge Plasmas ◽  
The Stability

Sheared flows perpendicular to the magnetic field can be driven by the Reynolds stress or ion pressure gradient effects and can potentially influence the stability and turbulent saturation level of edge plasma modes. On the other hand, such flows are subject to the transverse Kelvin–Helmholtz (KH) instability. Here, the linear theory of KH instabilities is first addressed with an analytic model in the asymptotic limit of long wavelengths compared with the flow scale length. The analytic model treats sheared $\boldsymbol{E}\times \boldsymbol{B}$ flows, ion diamagnetism (including gyro-viscous terms), density gradients and parallel currents in a slab geometry, enabling a unified summary that encompasses and extends previous results. In particular, while ion diamagnetism, density gradients and parallel currents each individually reduce KH growth rates, the combined effect of density and ion pressure gradients is more complicated and partially counteracting. Secondly, the important role of realistic toroidal geometry is explored numerically using an invariant scaling analysis together with the 2DX eigenvalue code to examine KH modes in both closed and open field line regions. For a typical spherical torus magnetic geometry, it is found that KH modes are more unstable at, and just outside of, the separatrix as a result of the distribution of magnetic shear. Finally implications for reduced edge turbulence modelling codes are discussed.

Siphon Flows in Stratified Coronal Loops

1994 ◽  
Vol 144 ◽  
pp. 185-187
Author(s):  
S. Orlando ◽  
G. Peres ◽  
S. Serio
Keyword(s):  
Heat Flux ◽  
Scaling Laws ◽  
Flow Model ◽  
Supersonic Flows ◽  
Coronal Loops ◽  
Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

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