Conservation laws with nonlocal velocity -- the singular limit problem

arXiv (Cornell University)

Abstract

We consider conservation laws with nonlocal velocity and show for nonlocal weights of exponential type that the unique solutions converge in a weak or strong sense (dependent on the regularity of the velocity) to the entropy solution of the local conservation law when the nonlocal weight approaches a Dirac distribution. To this end, we establish first a uniform total variation estimate on the nonlocal velocity which enables it to prove that the nonlocal solution is entropy admissible in the limit. For the entropy solution, we use a tailored entropy flux pair which allows the usage of only one entropy to obtain uniqueness (given some additional constraints). For general weights, we show that monotonicity of the initial datum is preserved over time which enables it to prove the convergence to the local entropy solution for rather general kernels and monotone initial datum as well. This covers the archetypes of local conservation laws: Shock waves and rarefactions. It also underlines that a ``nonlocal in the velocity'' approximation might be better suited to approximate local conservation laws than a nonlocal in the solution approximation where such monotonicity does only hold for specific velocities.

Authors 4

1. Jan O. Friedrich Aachen Institute of Applied Mathematics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University , Institute of Applied Mathematics , 52064 Aachen , Germany

2. Simone Göttlich
3. Alexander Keimer

   University of Mannheim · University of California Institute of Transportation Studies · University of California, Berkeley

   Affiliation as printed

   UC Berkeley , Institute of Transportation Studies (ITS) , Sutardja Dai Hall , Berkeley , US ;

   University of Mannheim , Department of Mathematics , 68131 Mannheim , Germany

4. Lukas Pflug

   Friedrich-Alexander-Universität Erlangen-Nürnberg

   Affiliation as printed

   Friedrich-Alexander Universität Erlangen-Nürnberg , Competence Unit for Scientific Computing , Martensstr. 5a , 91058 Erlangen , Germany