Abstract
Geometrical shock dynamics (GSD) is a simplified model for nonlinear shock wave propagation for which the front evolution is governed by a local relation between the geometry of the shock and its velocity, the so-called A–M rule. Numerous studies have proven the ability of the GSD model to estimate correctly the leading shock front in interactions with obstacles. Nevertheless, a solution for the problem of diffraction over a convex corner does not always exist, especially for weak shocks. To overcome this limitation, we propose an ad hoc modification of the A–M relation for two-dimensional configurations: an extra term based on the transverse variation of the Mach number is added. This new closure is fitted against experimental observations, which ensures, by construction, a correct behaviour for expansive shocks. A Lagrangian numerical solver is developed, for which this new term is activated only on specific parts of the front. Results of this new model are compared with the original GSD model, experiments, and Eulerian simulations for several cases of increasing complexity. A noticeable improvement in the solution is observed.
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Acknowledgements
Part of this work has been possible thanks to the LETMA collaboration: a contractual research laboratory between CEA, CNRS, École Centrale Lyon, C-Innov, and Sorbonne Université. We thank D.W. Schwendeman, from Rensselaer Polytechnic Institute, Troy, NY, USA, for useful discussions about the Lagrangian scheme.
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Communicated by M. Brouillette and A. Higgins.
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Ridoux, J., Lardjane, N., Monasse, L. et al. Beyond the limitation of geometrical shock dynamics for diffraction over wedges. Shock Waves 29, 833–855 (2019). https://doi.org/10.1007/s00193-018-00885-w
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DOI: https://doi.org/10.1007/s00193-018-00885-w