Solutions of the Riemann problem for the Self-Organized Hydrodynamics model

Christophe Berthon; Marie Compain; Carlos Parés; Ernesto Pimentel-García

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arXiv · 2610.37252

Solutions of the Riemann problem for the Self-Organized Hydrodynamics model

Christophe Berthon·Marie Compain·Carlos Parés·Ernesto Pimentel-García

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Abstract

The present paper is devoted to exhibit solutions of the Riemann problem for the Self-Organized Hydrodynamics model. The 2 x 2 system under consideration is strictly hyperbolic. With ambiguous non-conservative products, we adopt a non usual Generalized Rankine-Hugoniot jump condition to suitably define the shock wave solutions. This jump condition is obtained from the information given by the travelling wave solutions of the viscous extension of the system that involves the diffusion terms arising from the physics of the problem. We are then able to determine the simple waves of the non-conservative system studied here and we are able to construct some solutions of the Riemann problem of interest.

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Christophe Berthon, Marie Compain, Carlos Parés, Ernesto Pimentel-García. 2026-10-27. Solutions of the Riemann problem for the Self-Organized Hydrodynamics model. https://arxiv.org/abs/2610.37252

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