Electronic Resource
Springer
Journal of statistical physics
56 (1989), S. 517-524
ISSN:
1572-9613
Keywords:
Lattice gases
;
cellular automata
;
viscosity
;
turbulence
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A new irreversible collision rule is introduced for lattice-gas automata. The rule maximizes the flux of momentum in the direction of the local momentum gradient, yielding a negative shear viscosity. Numerical results in 2D show that the negative viscosity leads to the spontaneous ordering of the velocity field, with vorticity resolvable down to one lattice-link length. The new rule may be used in conjunction with previously proposed collision rules to yield a positive shear viscosity lower than the previous rules provide. In particular, Poiseuille flow tests demonstrate a decrease in viscosity by more than a factor of 2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01044449
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