Related Experiment Video
Updated: Aug 15, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
Published on: July 19, 2016
An extension of the steepest descent method for Riemann-Hilbert problems: the small dispersion limit of the
1Courant Institute, New York University, New York, NY 10012, USA.
Abstract:
This paper extends the steepest descent method for Riemann-Hilbert problems introduced by Deift and Zhou in a critical new way. We present, in particular, an algorithm, to obtain the support of the Riemann-Hilbert problem for leading asymptotics. Applying this extended method to small dispersion KdV (Korteweg-de Vries) equation, we (i) recover the variational formulation of P. D. Lax and C. D. Levermore [(1979) Proc. Natl. Acad. Sci. USA76, 3602-3606] for the weak limit of the solution, (ii) derive, without using an ansatz, the hyperelliptic asymptotic solution of S. Venakides that describes the oscillations; and (iii) are now able to compute the phase shifts, integrating the modulation equations exactly. The procedure of this paper is a version of fully nonlinear geometrical optics for integrable systems. With some additional analysis the theory can provide rigorous error estimates between the solution and its computed asymptotic expression.
Related Concept Videos
Divergence and Stokes' Theorems
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation
On...
Navier–Stokes Equations
Partial Differential Equations
Maximizing the Directional Derivative
Curl and Divergence of Vector Fields

