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Case T1

The T1 test case uses the existing analytical solutions. Several analytical solutions to the conduction problem with phase change exist: the Stefan solution, the solution by Lunardini, the Osterkamp solution. They all correspond to a 1D semi-infinite domain and an initial step of temperature at the boundary for an initially constant temperature domain. Following [McKenzie et al 2007] we prefer the Lunardini solution which, contrary to the Stefan solution (ice/water bar with phase change at 0°C) takes a range of temperature variation for the phase change. This configuration fits better to mo