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arXiv · 2609.39283

Hydrodynamic Limit of a Viscous BGK Model of the Boltzmann Equation

Gabriella Puppo·Thomas Rey·Tommaso Tenna
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Abstract

In this paper, we investigate a viscous regularization for the BGK model of the Boltzmann equation and its hydrodynamic limit. First, we establish rigorous convergence toward the viscous Euler equations, by exploiting bounds derived from spatial Fisher information. We then analyze the formal derivation of the Euler equations with an entropy inequality for both single-and multi-species case, comparing our results against symmetric hyperbolic thermodynamically compatible theory.

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Gabriella Puppo, Thomas Rey, Tommaso Tenna. 2026-09-30. Hydrodynamic Limit of a Viscous BGK Model of the Boltzmann Equation. https://arxiv.org/abs/2609.39283

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