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O adaptivních časových krocích pro počítačovou simulaci přesunů tepla a hmoty při vakuovém vymrazování
 Georgiev, K. ; Kosturski, N. ; Margenov, S. ; Starý, Jiří
The work is motivated by the problem of freeze-drying, which is a process of dehydrating frozen materials by sublimation under high vacuum. Especially, it concerns the mathematical modelling and computer simulation of the heat and mass transfer with the core in solving the time-dependent nonlinear partial differential equation of parabolic type. Instead of an uniform discretization of the considered time interval, an adaptive time stepping procedure is applied in an effort to optimize the whole simulation. The procedure is based on the local comparison of the Crank-Nicholson and backward Euler time steps. The results of numerical experiments performed on a selected real-life problem are included.
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