Distribution function for large velocities of a two-dimensional gas under shear flow |
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Authors: | J M Montanero A Santos V Garzó |
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Institution: | (1) Departamento de Electrónica e Ingeniería Electromecánica, Universidad de Extremadura, E-06071 Badajoz, Spain;(2) Departmento de Física, Universidad de Extremadura, E-06071 Badajoz, Spain |
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Abstract: | The high-velocity distribution of a two-dimensional dilute gas of Maxwell molecules under uniform shear flow is studied. First
we analyze the shear-rate dependence of the eigenvalues governing the time evolution of the velocity moments derived from
the Boltzmann equation. As in the three-dimensional case discussed by us previously, all the moments of degreek⩾4 diverge for shear rates larger than a critical valuea
c
(k)
, which behaves for largek asa
c
(k)
∼k
−1. This divergence is consistent with an algebraic tail of the formf(V) ∼V
−4-σ(a), where σ is a decreasing function of the shear rate. This expectation is confirmed by a Monte Carlo simulation of the Boltzmann
equation far from equilibrium. |
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Keywords: | Boltzmann equation velocity moments Maxwell molecules uniform shear flow DSMC method |
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