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Transient behavior of a model fluid under applied shear
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Image of FIG. 1.
FIG. 1.

Viscosity as a function of the shear rate γ. Steady-state (circles) and D-NEMD (triangles) data of this work are shown along with steady-state results of Ref. (crosses).

Image of FIG. 2.
FIG. 2.

D-NEMD transient behavior of for different values of (indicated in the legend) with γ = 0.50 (a) and γ = 5.0 (b).

Image of FIG. 3.
FIG. 3.

D-NEMD viscous dynamical response η(), see Eq. (20) , for different shears γ (symbols, see the legend). Lines are the best-fits of data points, η(), according to Eq. (23) .

Image of FIG. 4.
FIG. 4.

Behavior of η() for progressively longer simulation runs, = 1.0 t.u. (circles), = 2.0 t.u. (triangles), and = 4.0 t.u. (diamonds), with γ = 0.10 (a) and γ = 5.0 (b). Lines are the best-fits η() obtained for the = 1.0 t.u. trajectories. For clarity sake, data points and curves are progressively shifted by 0.2 along the vertical axis.

Image of FIG. 5.
FIG. 5.

Behavior of η() for a progressively larger non-equilibrium configurations (indicated in the legend), with γ = 0.50 (a) and γ = 5.0 (b). For clarity sake, point data are progressively shifted by 0.2 along the vertical axis.

Image of FIG. 6.
FIG. 6.

Behavior of η() with (full symbols) and without (open symbols) enforced configurational thermostat, for different shears γ indicated in the legend.

Image of FIG. 7.
FIG. 7.

η() (full lines) resolved into the configurational (dashed lines) and kinetic (dotted lines, appearing almost superimposed at the bottom) contributions, see Eq. (19) , with γ = 0.50, 1.0, 2.0, and 5.0 (from top to bottom).


Generic image for table
Table I.

Steady-state and D-NEMD data for the viscosity at different shears. Uncertainties are reported in parentheses.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transient behavior of a model fluid under applied shear