Different models are used today to model air gap formation during a solidification process. In this work air gap modelling is discussed with reference to experimental work with air gap measurements during casting. Thermal and thermomechanical modelling were done with thermal boundary conditions found experimentally. The measured displacements of the mould and the solidifying metal were used in order to check the validity of the simulation results and compare it with reality. The description of the thermal shrinkage and its connection to air gap formation is especially discussed. Al- and Fe-based alloys investigated elsewhere have been used in this work.
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