Víctor Calo (KAUST) nos acerca este llamado para una posición en Lamcos Lab of INSA-Lyon in Villeurbanne, France.
[El PDF completo se puede obtener aqui http://venus.santafe-conicet.gov.ar/~mstorti/tempo/post_doc_NURBS.pdf] ==================================================================== ISOGEOMETRIC F-BAR PROJECTION METHOD OVER HEXAHEDRAL AND TETRAHEDRAL NURBS USING THE FEBIO FINITE ELEMENT PACKAGE AND THE IRIT MODELING ENVIRONMENT. Context and aims ---------------- The modeling of incompressible materials at large strains such as rubber is a challenging computational issue. For the efficient design of industrial parts made out of such materials, for example car door gaskets, not only is the computational efficiency important but also the easiness of mesh generation. Indeed, efficient numerical methods for performing such incompressible simulations require the use of low order hexahedral finite elements for which no generic automatic mesh generator is available. Isogeometric Analysis is a new computational paradigm that was proposed recently by Hughes et al. [1]. It relies on the geometric primitives used in CAD and computer graphics. Mainly developed using Non-Uniform Rational B-Splines, the method uses these functions for both the geometric description (as it the case in most CAD packages) as well as for finite element shape functions. IGA has proven to be very efficient in lots of cases, in particular for incompressible simulation when coupled with projection methods, see Elguedj et al. [2] and Lipton et al. [3]. Projection methods can circumvent the usual incompressible locking of finite element based methods. Their use within IGA with higher order NURBS provides a robust and efficient method for such complex numerical simulations. The main goals of this project are the following: ------------------------------------------------- * Introduce the NURBS based IGA technology in the open source finite element package FEBio [4] that has been chosen as the new research oriented platform of Hutchinson computational research group. This will be done in collaboration with Gershon Elber from the Center for Graphics and Geometric Computing of Technion University in Israel. A close interfacing with Gershon Elber geometric modeling environment IRIT [5] will be done. * Implement the F-bar in FEBio for NURBS based IGA. The method will be extended to multiple patches geometries, and efficient computational strategies for the calculation of the algorithmic tangent will be studied. The initial method based on a strong modification of the iterative linear solver [2] will be tested as well as simpler and less intrusive alternatives. The recent ideas proposed by Taylor [6] will be considered as a starting point. * Extend the method to tetrahedral based NURBS meshes. For this task a close collaboration with Gershon Elbers s group will take place. The Technion group will be responsible for the development of smooth NURBS across tetrahedral elements. The INSA group will be responsible for the extension of the F-bar projection method to such meshes. The milestone in this task will mainly be the definition of the projector and projection spaces. Qualifications required ----------------------- * The application should have a PhD in Computational Mechanics. * Good knowledge of theoretical and programing concepts of finite element methods for nonlinear applications. * Strong programming experience possibly in C++ or other object oriented languages. * An initial knowledge of NURBS and/or IGA will be considered as a plus. Good skills in English (reading, writing and speaking). Duration and salary ------------------- The duration for the post-doc is two years (24 months). The position opens March 1st. The salary will be of around 2000 net per month. The postdoc will be based at the Lamcos Lab of INSA-Lyon in Villeurbanne, France (Rhône-Alpes area). At least one stay of approximately two weeks in Technion University will take place during the project. Contact ------- Thomas Elguedj (Assistant Professor of Mechanical Engineering, INSA-Lyon). thomas.elgu...@insa-lyon.fr, +33 (0) 4 72 43 73 68. Bibliography ------------ [1] J. A. Cottrell, T. J. R. Hughes, and Y. Bazilevs. Isogeometric Analysis: Toward Integration of CAD and FEA. Wiley, 2009. [2] T. Elguedj, Y. Bazilevs, V. M. Calo, and T. J. R. Hughes. B-bar and F-bar projection methods for nearly incompressible linear and non-linear elasticity and plasticity based on higher-order NURBS elements. Computer Methods in Applied Mechanics and Engineering, 197:2732 2762, 2008. [3] S. Lipton, J. A. Evans, Y. Bazilevs, T. Elguedj, and T. J.R. Hughes. Robustness of isogeometric structural discretizations under severe mesh distortion. Computer Methods in Applied Mechanics and Engineering, 199(5:8):2297 2317, 2009. [4] FEBio web page http://mrl.sci.utah.edu/febio-overview, visited 01/13/2011. [5] IRIT web page http://www.cs.technion.ac.il/~irit/, visited 01/13/2011. [6] R. L. Taylor, Isogeometric analysis of nearly incompressible solids. International Journal for Numerical Methods in Engineering, doi: 10.1002/nme.3048. ==================================================================== -----<*>-----<*>-----<*>--.N.O.T.I.A.M.C.A.--<*>-----<*>-----<*>-----<*> Los mensajes son archivados en la pagina Web del AMCA http://www.amcaonline.org.ar/ -----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>-----<*>