TY - JOUR
T1 - Numerical study of a multiscale expansion of the Korteweg-de Vries equation and PainlevĂ©-II equation
JF - Proc. R. Soc. A 464 (2008) 733-757
Y1 - 2008
A1 - Tamara Grava
A1 - Christian Klein
AB - The Cauchy problem for the Korteweg de Vries (KdV) equation with small dispersion of order $\\\\e^2$, $\\\\e\\\\ll 1$, is characterized by the appearance of a zone of rapid modulated oscillations. These oscillations are approximately described by the elliptic solution of KdV where the amplitude, wave-number and frequency are not constant but evolve according to the Whitham equations. Whereas the difference between the KdV and the asymptotic solution decreases as $\\\\epsilon$ in the interior of the Whitham oscillatory zone, it is known to be only of order $\\\\epsilon^{1/3}$ near the leading edge of this zone. To obtain a more accurate description near the leading edge of the oscillatory zone we present a multiscale expansion of the solution of KdV in terms of the Hastings-McLeod solution of the Painlev\\\\\\\'e-II equation. We show numerically that the resulting multiscale solution approximates the KdV solution, in the small dispersion limit, to the order $\\\\epsilon^{2/3}$.
UR - http://hdl.handle.net/1963/2592
U1 - 1530
U2 - Mathematics
U3 - Mathematical Physics
ER -