Cryospheric phase-change beyond Stefan's problem - how predictive can we be?

This presentation focuses on the physics-based prediction of complex solid-liquid phase-change processes in the cryosphere. A classical, yet highly idealized approach to model such phase-change processes is referred to as the Stefan problem. Many applications, however, are characterized by physical regimes that do not comply with the idealized assumptions of this classical model. Here, we will concentrate on convection-coupled phase-change [1] as well as phase-change in the presence of a global contact forces (so-called contact phase-change) [2], both of which are rather challenging from a model development point of view. We will introduce tailored computational models, show their feasibility (when being leveraged for the model-based development of a cryo-robot for extraterrestrial ice exploration [3]), and close with a discussion of their potential and limitation regarding the envisioned process predictability.

Related links:

1.
Leonardo Boledi, Benjamin Terschanski, Stefanie Elgeti, Julia Kowalski
A level-set based space-time finite element approach to the modelling of solidification and melting processes
2.
K.Schüller, J.Kowalski, P.Råback
Curvilinear melting – A preliminary experimental and numerical study
3.
K.SchüllerJ.Kowalski
Melting probe technology for subsurface exploration of extraterrestrial ice – Critical refreezing length and the role of gravity

Icarus, Volume 317, 1 January 2019, Pages 1-9

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