scholarly journals Two-fluid turbulence including electron inertia

2014 ◽  
Vol 21 (12) ◽  
pp. 122305 ◽  
Author(s):  
Nahuel Andrés ◽  
Carlos Gonzalez ◽  
Luis Martin ◽  
Pablo Dmitruk ◽  
Daniel Gómez
Keyword(s):  
Fluid Turbulence ◽  
Electron Inertia ◽  
Two Fluid

scholarly journals Scrape-off-layer current loops and floating potential in limited tokamak plasmas

2017 ◽  
Vol 83 (6) ◽  
Author(s):  
J. Loizu ◽  
J. A. Morales ◽  
F. D. Halpern ◽  
P. Ricci ◽  
P. Paruta
Keyword(s):  
Fluid Model ◽  
Radial Profile ◽  
Floating Potential ◽  
Tokamak Plasmas ◽  
Fluid Turbulence ◽  
Two Fluid Model ◽  
The One ◽  
Dipolar Structure ◽  
Two Fluid ◽  
Asymmetric Equilibrium

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents that are not divergence-free. These include turbulence-driven polarization currents and poloidally asymmetric equilibrium diamagnetic currents. The theory provides an estimate for the radial profile of the floating potential, which reveals a dipolar structure like the one observed experimentally. Simulations with a fluid turbulence code provide evidence for the predicted behaviour of currents and floating potential.

scholarly journals Observational diagnostics for two-fluid turbulence in molecular clouds as suggested by simulations

2014 ◽  
Vol 439 (3) ◽  
pp. 2197-2210 ◽  
Author(s):  
Chad D. Meyer ◽  
Dinshaw S. Balsara ◽  
Blakesley Burkhart ◽  
Alex Lazarian
Keyword(s):  
Molecular Clouds ◽  
Fluid Turbulence ◽  
Two Fluid

Solitons in two-fluid MHD taking account electron inertia

2016 ◽  
Author(s):  
A. A. Taiurskii ◽  
M. B. Gavrikov ◽  
V. V. Savel’ev
Keyword(s):  
Electron Inertia ◽  
Two Fluid ◽  
Account Electron

scholarly journals A Two-Fluid Turbulence Model for Gas-Solid Two-Phase Flows.

1997 ◽  
Vol 30 (3) ◽  
pp. 526-534 ◽  
Author(s):  
Yunliang Wang ◽  
Satoru Komori ◽  
Myung Kyoon Chung
Keyword(s):  
Turbulence Model ◽  
Two Phase Flows ◽  
Two Phase ◽  
Fluid Turbulence ◽  
Two Fluid

New Two-Fluid Turbulence Model Based Numerical Simulation of Flow in a Flat Suddenly Expanding Channel

2021 ◽  
pp. 24-39
Author(s):  
Z.M. Malikov ◽  
M.E. Madaliev
Keyword(s):  
Turbulence Model ◽  
Control Volume ◽  
Difference Approximation ◽  
Flat Channel ◽  
Central Difference ◽  
Fluid Turbulence ◽  
Before And After ◽  
Nonstationary Equations ◽  
The Difference ◽  
Two Fluid

The purpose of the research was to numerically study the structure of the flow in a flat channel in the zone of its sudden step-like expansion. The results of the study are given in the paper. The calculations are carried out with the use of a new two-fluid turbulence model and are based on the numerical solution of a system of nonstationary equations. The profiles of axial velocity and turbulent stress in various sections of the channel before and after the step were obtained, as well as the dependence of the friction coefficient for the lower wall of the channel on the distance after the step. For the difference approximation of the initial equations, the control volume approach was applied; the relationship between the velocities and pressure was found using the SIMPLEC procedure. Meanwhile, the viscosity terms were approximated by the central difference, and for the convective terms the QUICK second-order accuracy scheme was used. To confirm the correctness of the numerical results, we compared them with the experimental data taken from the NASA database for the Reynolds number Re = 36,000. The results obtained using the SA and SST models are also given in the paper. Despite the coarse grid used for numerical calculations, the results based on the new two-fluid turbulence model are not less accurate than the results determined by the RANS models for predicting separated flows in the flat channel in the zone of its sudden backward-facing step expansion

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