Skip to main content

This job has expired

CEMEF PhD 2017:New 3D Finite-Element meshing/remeshing approach for large-scale dynamic polycrystals

Employer
Global Academy Jobs
Location
France
Closing date
Sep 15, 2017

Job Details

3-years research study at CEMEF.

The Centre for Material Forming (CEMEF) is one of the research laboratories of MINES ParisTech (top executive French engineering school).
CEMEF studies the materials processings in all their aspects: physics, chemical physics, thermal and mechanical analysis and numerical modelling. Researches are on a large range of materials: metals, synthetic and bio polymers, food stuff, composites and nanocomposites, glass, ceramics…

Thesis work description:
 
DIGIMU is an ANR industrial Chair handled by ARMINES MINES ParisTech and co-funded by ANR and an industrial consortium formed by ArcelorMittal, AREVA, ASCOMETAL, AUBERT & DUVAL, CEA and SAFRAN. This Chair deals Partners with the Development of an Innovative and Global framework for the ModelIng of MicrostrUctural evolutions involved in metal forming processes. DIGIMU® is also the name of the resulting software developed by the company TRANSVALOR as a project partner. Countless products involved in our every-day life rely on vital metal parts. Optimizing these parts requires a knowledge of how material properties change during forming operations. Although the understanding of the underlying metallurgical phenomena has improved thanks to the continuous progress of experimental facilities, the interest for increasingly fine and predictive simulations has been recently growing. In this emerging context of “digital metallurgy”, the DIGIMU Chair and consortium have two main objectives. The first one is to develop an efficient multiscale numerical framework specifically designed to tackle such problems. The second one is to bring the corresponding numerical methods to an industrial level of maturity, by decreasing significantly their computational cost and by validating them against the industrial expertise existing in the DIGIMU consortium.

In order to accurately describe the 3D evolution of polycrystals (recrystallization, phase transformations…), full-field methods such as the phase-field or the level-set methods have to be employed. Despite the recent introduction of HPC techniques in metallurgy, the main weakness of these methods still lies in their computational cost. Optimized 3D meshing and remeshing strategies are an interesting alternative for overcoming this problem, as illustrated in the figure below. Nevertheless, it seems that state-of-the-art methodologies involving unstructured Finite-Element (FE) meshes will remain incapable of carrying out large-scale computations (∼ 10000 to 100000 grains) with reasonable computational facilities.

In the proposed PhD project, a new 3D mesh adaptation technique that combines explicit meshing of interfaces and implicit level set (LS) description will be investigated to reach this objective. Front-capturing approaches based on the plain LS method can suffer from spurious deformations of inter-grain interfaces due to numerical diffusion, particularly during the remeshing operations required to follow the interface motion. Comparatively, the new technique has been shown to drastically reduce the volume loss at remeshinga in the context of biphasic materials, with a beneficial impact on the overall computational cost. This quite prospective approach will be complemented with a more classical investigation of anisotropic mesh adaptation procedures driven by new geomet- ric error estimators that are specific to 3D polycrystals. Finally, the resulting developments will be applied to industrial-scale cases and prepared for integration in the DIGIMU® software package.
 

Company

Global Academy Jobs works with over 250 universities worldwide to promote academic mobility and international research collaboration. Global problems need international solutions. Our jobs board and emails reach the academics and researchers who can help.

"The globalisation of higher education continues apace, driving in turn the ongoing development of the global knowledge economy, striving for solutions to the world’s problems and educating a next generation of leaders and contributors."

Company info
Website

Get job alerts

Create a job alert and receive personalized job recommendations straight to your inbox.

Create alert