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1 GeM - Institut de Recherche en Génie Civil et Mécanique 2 Aragón Institute of Engineering Research I3A Zaragoza 3 LAMPA-ECPS - Laboratoire Arts et Métiers ParisTech - Ecoulements Complexes Photonique et Surfaces 4 LaCàN - Laboratori de Càlcul Numèric

Abstract : In this paper we are addressing a new paradigm in the field of simulation-based engineering sciences SBES to face the challenges posed by current ICT technologies. Despite the impressive progress attained by simulation capabilities and techniques , some challenging problems remain today intractable. These problems, that are common to many branches of science and engineering, are of different nature. Among them, we can cite those related to high-dimensional problems, which do not admit mesh-based approaches due to the exponential increase of degrees of freedom. We developed in recent years a novel technique, called Proper Generalized Decomposition PGD. It is based on the assumption of a separated form of the unknown field and it 2 has demonstrated its capabilities in dealing with high-dimensional problems overcoming the strong limitations of classical approaches. But the main opportunity given by this technique is that it allows for a completely new approach for classic problems, not necessarily high dimensional. Many challenging problems can be efficiently cast into a multidimensional framework and this opens new possibilities to solve old and new problems with strategies not envisioned until now. For instance, parameters in a model can be set as additional extra-coordinates of the model. In a PGD framework, the resulting model is solved once for life, in order to obtain a general solution that includes all the solutions for every possible value of the parameters, that is, a sort of virtual chart. Under this rationale, optimization of complex problems, uncertainty quantifica-tion, simulation-based control and real-time simulation are now at hand, even in highly complex scenarios, by combining an off-line stage in which the general PGD solution, the virtual chart, is computed, and an on-line phase in which, even on deployed, hand-held, platforms such as smartphones or tablets, real-time response is obtained as a result of our queries.

Autor: Francisco Chinesta - Adrien Leygue - Felipe Bordeu - Elias Cueto - David Gonzalez - Amine Ammar - Antonio Huerta -



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