The inviscid Burgers equation with initial data of Brownian type View Full Text


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Article Info

DATE

1992-09

AUTHORS

Zhen-Su She, Erik Aurell, Uriel Frisch

ABSTRACT

The solutions to Burgers equation, in the limit of vanishing viscosity, are investigated when the initial velocity is a Brownian motion (or fractional Brownian motion) function, i.e. a Gaussian process with scaling exponent 0by the fact that the solution is essentially obtained by performing a Legendre transform. The main result is obtained for typeA and concerns the Lagrangian functionx(a) which gives the location at timet=1 of the fluid particle which started at the locationa. It is found to be a complete Devil's staircase. The cumulative probability of Lagrangian shock intervals Δa (also the distribution of shock amplitudes) follows a (Δa)−h law for small Δa. The remaining (regular) Lagrangian locations form a Cantor set of dimensionh. In Eulerian coordinates, the shock locations are everywhere dense. The scaling properties of various statistical quantities are also found. Heuristic interpretations are provided for some of these results. Rigorous results for the case of Brownian motion are established in a companion paper by Ya. Sinai. For typeB initial velocities (e.g. white noise), there are very few small shocks and shock locations appear to be isolated. Finally, it is shown that there are universality classes of random but smooth (non-scaling) initial velocities such that the long-time large-scale behavior is, after rescaling, the same as for typeA orB. More... »

PAGES

623-641

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02096551

DOI

http://dx.doi.org/10.1007/bf02096551

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050362339


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