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In this paper we consider a one-dimensional non-stationary heat conduction problem, with initial datum and with mixed boundary conditions. We obtain, with an implicit finite difference scheme, some sufficient conditions, so that the discrete solution is positive at any moment if it is positive at the previous time step. We also deduce, with an explicit finite difference scheme, the discrete expression of the temperature at each time step, as a polynomial in the variable , with coefficients ! œ ? ? t x2 given as function of the problem dates. So we can establish some sufficient conditions on the data in order to obtain the existence of a waiting time at wich a phase-change begins.

Conditions to obtain a waiting time for a discrete two-phase stefan problem