Some modeling and numerical aspects of the two-fluid simulation of the gas-solids flow in a CFB riser

By means of the formation of vortices in the nonlinear phase, the Kelvin Helmholtz instability is able to redistribute the flux of energy of the solar wind that flows parallel to the magnetopause. The energy transport associated with the Kelvin Helmholtz instability contributes significantly to the magnetosphere and magnetosheath dynamics, in particular at the flanks of the magnetopause where the presence of a magnetic field perpendicular to the velocity flow does not inhibit the instability development. By means of a 2D two-fluid simulation code, the behavior of the Kelvin Helmholtz instability is investigated in the presence of typical conditions observed at the magnetopause. In particular, the energy penetration in the magnetosphere is studied as a function of an important parameter such as the solar wind velocity. The influence of the density jump at the magnetopause is also discussed.

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Two-fluid simulation of liquid drainage in oscillating packed beds for offshore floating applications

Chemical Engineering Science ◽

10.1016/j.ces.2016.04.028 ◽

2016 ◽

Vol 149 ◽

pp. 51-62 ◽

Cited By ~ 6

Author(s):

Ion Iliuta ◽

Faïçal Larachi

Keyword(s):

Fluid Simulation ◽

Packed Beds ◽

Two Fluid

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Reaching the statistical steady state regime in two-fluid simulation of risers

Powder Technology ◽

10.1016/j.powtec.2006.06.002 ◽

2006 ◽

Vol 167 (1) ◽

pp. 26-32 ◽

Cited By ~ 6

Author(s):

Christian Costa Milioli ◽

Fernando Eduardo Milioli

Keyword(s):

Steady State ◽

Fluid Simulation ◽

Steady State Regime ◽

State Regime ◽

Two Fluid

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Kelvin-Helmholtz vortices and secondary instabilities in super-magnetosonic regimes

Annales Geophysicae ◽

10.5194/angeo-29-1169-2011 ◽

2011 ◽

Vol 29 (6) ◽

pp. 1169-1178 ◽

Cited By ~ 10

Author(s):

F. Palermo ◽

M. Faganello ◽

F. Califano ◽

F. Pegoraro

Keyword(s):

Plasma Density ◽

Relative Motion ◽

Plasma Flow ◽

Fluid Simulation ◽

Nonlinear Behaviour ◽

Two Dimensional ◽

Helmholtz Instability ◽

Simulation Code ◽

Secondary Instabilities ◽

Two Fluid

Abstract. The nonlinear behaviour of the Kelvin-Helmholtz instability is investigated with a two-fluid simulation code in both sub-magnetosonic and super-magnetosonic regimes in a two-dimensional configuration chosen so as to represent typical conditions observed at the Earth's magnetopause flanks. It is shown that in super-magnetosonic regimes the plasma density inside the vortices produced by the development of the Kelvin-Helmholtz instability is approximately uniform, making the plasma inside the vortices effectively stable against the onset of secondary instabilities. However, the relative motion of the vortices relative to the plasma flow can cause the formation of shock structures. It is shown that in the region where the shocks are attached to the vortex boundaries the plasma conditions change rapidly and develop large gradients that allow for the onset of secondary instabilities not observed in sub-magnetosonic regimes.

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