Negative-viscosity lattice gases View Full Text


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Article Info

DATE

1989-08

AUTHORS

Daniel H. Rothman

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. More... »

PAGES

517-524

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01044449

DOI

http://dx.doi.org/10.1007/bf01044449

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011606484


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