The PhD, hosted at LMGC (Laboratoire de Mécanique et Génie Civil, Université de Montpellier), will focus on the numerical modeling of dense assemblies of rigid, star-shaped meta-grains using the Discrete Element Method (DEM). The doctoral candidate will perform 3D periodic simulations to investigate how particle shape parameters—such as the number, length, and orientation of arms—influence the emergence of macroscopic (geometric) cohesion under quasistatic shear.
After an initial phase dedicated to a literature review and training on DEM simulation tools, the candidate will design and shear various assemblies of non-convex grains. Using existing numerical frameworks developed at LMGC, they will extend post-processing routines to compute mechanical observables including stress, strain, and contact network characteristics.
The primary objective of this first PhD project is to determine the effective cohesion (c) and friction angle (ϕ) derived from Mohr–Coulomb envelopes and to analyze their dependence on particle geometry, contact friction, and system size. The work will result in a database of 3D metagrain shapes and configurations that exhibit measurable geometric cohesion.
Additionally, the candidate will conduct complementary experimental validation on a selected subset of metagrain geometries identified through DEM simulations. These proof-of-concept experiments, carried out in collaboration with PhD 2, will assess the robustness of the numerical predictions related to the onset of geometric cohesion. This cross-disciplinary approach will provide the candidate with a comprehensive understanding of both numerical modeling and experimental techniques in the field of granular physics.
Candidate Profile
Applicants should hold a Master’s degree in Mechanical Engineering, Physics, Materials Science, or Civil Engineering.
- strong skills in numerical modeling (Discrete Element Method – DEM, Python/C++) and a strong interest in computational mechanics are expected.
Both candidates should be curious, autonomous, and motivated by interdisciplinary research bridging granular physics, materials science, physics, and civil engineering.
Proficiency in English is required; knowledge of French will be considered an asset.
Practical Information
- Duration: 3 years
- Starting date: 2026 (flexible)
- Funding: Fully funded by the French National Research Agency (ANR) under project Exo2GeCo
- Locations: Montpellier (LMGC) / Alès (IMT Mines Alès)
- Research Axis and Hosting Team: The project will be conducted within the Milieux Divisés research axis of the Laboratoire de Mécanique et Génie Civil (LMGC).
Supervising and collaborating team:- LMGC / Université de Montpellier: Emilien Azéma (PR), Mathieu Renouf (CR), Jonathan Barés (IR), Rémy Mozul (IR)
- LMGC / IMT Mines Alès: Arnaud Regazzi (Ass. Pr), Patrick Ienny (Pr), Sylvain Buonomo (IR)
- International Collaboration: Conducted in partnership with the Universidad de los Andes (Bogotá, Colombia), Department of Civil and Environmental Engineering, with Prof. Nicolás Estrada.
Short research stays at Los Andes University will be possible during the PhD program.
Application Procedure
Applicants should send a single PDF file including:
- A detailed CV
- A motivation letter indicating the preferred PhD position (or both)
- Academic transcripts
- Contact details of two referees
Applications and inquiries should be sent to:
- emilien.azema@umontpellier.fr
- arnaud.regazzi@mines-ales.fr
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