Conservation laws and Hamilton-Jacobi equations on a junction: The convex case

Pierre Cardaliaguet; Nicolas Forcadel; Théo Girard; Régis Monneau

doi:10.3934/dcds.2024082

Article Contents

2024, Volume 44, Issue 12: 3920-3961. Doi: 10.3934/dcds.2024082

This issue Previous Article Well-posedness of the co-rotational Beris-Edwards system with the Landau-De Gennes energy in $ L^{3}_{uloc}(\mathbb{R}^3) $ Next Article Inheritance of minimality from continuous to discrete time systems

Conservation laws and Hamilton-Jacobi equations on a junction: The convex case

1.
CEREMADE, UMR CNRS 7534, Université Paris Dauphine-PSL, Place de Lattre de Tassigny, 75775 Paris Cedex 16, France
2.
INSA Rouen Normandie, Normandie Univ, LMI UR 3226, F-76000 Rouen, France
3.
Institut Denis Poisson, Université de Tours, Parc Grandmont, 37200 Tours, France
4.
CERMICS, Université Paris-Est, Ecole des Ponts ParisTech, 6-8 avenue Blaise Pascal, 77455 Marne-la-Vallée Cedex 2, France

^*Corresponding author: Nicolas Forcadel
^*Corresponding author: Nicolas Forcadel

Received: November 2023

Revised: May 2024

Early access: June 2024

Published: December 2024

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Abstract

The goal of this paper is to study the link between the solution to an Hamilton-Jacobi (HJ) equation and the solution to a Scalar Conservation Law (SCL) on a special network. When the equations are posed on the real axis, it is well known that the space derivative of the solution to the Hamilton-Jacobi equation is the solution to the corresponding scalar conservation law. On networks, the situation is more complicated and we show that this result still holds true in the convex case on a 1:1 junction. The correspondence between solutions to HJ equations and SCL on a 1:1 junction is done showing the convergence of associated numerical schemes. A second direct proof using semi-algebraic approximations is also given.

Here a 1:1 junction is a simple network composed of two edges and one vertex. In the case of three edges or more, we show that the associated HJ germ is not a $ L^1 $-dissipative germ, while it is the case for only two edges.

As an important byproduct of our numerical approach, we get a new result on the convergence of numerical schemes for scalar conservation laws on a junction. For a general desired flux condition which is discretized, we show that the numerical solution with the general flux condition converges to the solution of a SCL problem with an effective flux condition at the junction. Up to our knowledge, in previous works the effective condition was directly implemented in the numerical scheme. In general the effective flux condition differs from the desired one, and is its relaxation, which is very natural from the point of view of Hamilton-Jacobi equations. Here for SCL, this effective flux condition is encoded in a germ that we characterize at the junction.

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Mathematics Subject Classification: 35L65, 35R02, 35D40, 35F20.

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