CIMEC   24726
CENTRO DE INVESTIGACION DE METODOS COMPUTACIONALES
Unidad Ejecutora - UE
artículos
Título:
Global-local HROM for non-linear thermal problems with irreversible changes of material states
Autor/es:
SERGIO IDELSOHN; ALBERTO CARDONA; ALEJANDRO COSIMO
Revista:
COMPTES RENDUS MECANIQUE
Editorial:
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Referencias:
Lugar: Paris; Año: 2018 vol. 346 p. 539 - 555
ISSN:
1631-0721
Resumen:
Problems characterised by highly concentrated moving non-linearities are within the most challenging to be solved by a numerical scheme. The simulation of the Selective Laser Melting Additive Manufacturing process, intractable by traditional numerical techniques, is a problem of this kind. In this work, a material Global-Local scheme is proposed for the case of non-linear thermal problems with irreversible phase changes and highly concentrated heat sources. The Global-Local scheme consists in describing the neighbourhood of the heat source by a moving local domain while the material phase fractions are represented in a global domain. A first approach is proposed, in which the equations governing the non-linear thermal problem are assumed to be defined on the local domain only. This is equivalent to consider that the extent of the local domain is large enough to capture the most important variations of the temperature field. Additionally, a Hyper-Reduced OrderModel based on a variant of the Energy-Conserving Sampling and Weighting method is proposed for the local domain problem. The performance of the introduced numerical techniques is studied by solving a SLM problem taken from the literature.