We study the multi-phase Stefan problem with increasing Riemann initial data and generally negative latent specific heats for phase transitions. We propose a variational formulation of self-similar solutions, which allows us to find precise conditions for the existence and uniqueness of a solution.
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V. V. Pukhnachev, “Occurrence of a singularity in the solution of a Stefan-type problem” Differ. Equations 16, 313–318 (1980).
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Panov, E.Y. Solutions of An Ill-Posed Stefan Problem. J Math Sci 274, 534–543 (2023). https://doi.org/10.1007/s10958-023-06618-4
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DOI: https://doi.org/10.1007/s10958-023-06618-4