Article Dans Une Revue Physical Review Letters Année : 2015

Blast dynamics in a dissipative gas

Résumé

The blast caused by an intense explosion has been extensively studied in conservative fluids, where the Taylor-von Neumann-Sedov hydrodynamic solution is a prototypical example of self-similarity driven by conservation laws. In dissipative media however, energy conservation is violated, yet a distinctive self-similar solution appears. It hinges on the decoupling of random and coherent motion permitted by a broad class of dissipative mechanisms. This enforces a peculiar layered structure in the shock, for which we derive the full hydrodynamic solution, validated by a microscopic approach based on Molecular Dynamics simulations. We predict and evidence a succession of temporal regimes, as well as a long-time corrugation instability, also self-similar, which disrupts the blast boundary. These generic results may apply from astrophysical systems to granular gases, and invite further cross-fertilization between microscopic and hydrodynamic approaches of shockwaves.
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Dates et versions

hal-01237728 , version 1 (18-02-2025)

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Matthieu Barbier, Dario Villamaina, Emmanuel Trizac. Blast dynamics in a dissipative gas. Physical Review Letters, 2015, 115, pp.214301. ⟨10.1103/PhysRevLett.115.214301⟩. ⟨hal-01237728⟩
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