PhD Candidate / PhD Candidate

PhD Position in Numerical and Experimental Studies of Non-Spherical and Deformable Granular Systems

100%, Zurich, fixed-term

ETH Zurich is one of the world's leading universities, renowned for its excellence in education, cutting-edge fundamental research, and its efforts to put new knowledge and innovations into practice. The Laboratory of Energy Science and Engineering (D-MAVT) is actively engaged in developing numerical and experimental tools to investigate single- and multiphase granular (particulate) systems.

Project Background

Granular systems are ubiquitous in nature (e.g., rock avalanches and dunes) and hold fundamental importance in various industrial applications. However, despite their widespread use and occurrence, numerous critical phenomena—such as segregation, surface instabilities, and jamming (the transition from fluid-like to solid-like states)—remain poorly understood. This project specifically explores the effects of particle deformability and non-sphericity on the dynamics and rheology of granular systems. Flexible particles deform under stress, which in turn affects contact forces and stress transmission, leading to complex rheological phenomena such as transient jamming and stress-induced orientational ordering. Although systems of deformable, aspherical particles are expected to exhibit rich physical phenomena, they have largely been overlooked due to challenges in experimental measurement and numerical modeling.

This PhD position is part of a collaborative project that combines the expertise of two research groups (Laboratory of Energy Science and Engineering led by Prof. Müller and the Institute for Biomedical Imaging Magnetic Resonance Technology led by Prof. Prüssmann). PhD students from both groups are expected to collaborate daily.

Job Description

The primary objectives for the PhD student at the Laboratory of Energy Science and Engineering are to:

• Advance numerical tools to model non-spherical and deformable granular systems.
• Establish camera-based experimental techniques, such as photoelasticimetry, to determine contact forces and stress fields within these systems.
• Develop and utilize machine-learning-based models to correlate particle deformation and contact forces in 3D systems.

Profile

• Applicants should possess a strong MSc degree in Mechanical Engineering, Physics, or related fields.
• Previous experience in numerical modeling or imaging techniques is desirable.
• We seek highly motivated, committed, and creative individuals who can work collaboratively and possess excellent communication skills in English, both oral and written.
• The candidate will have a unique opportunity to advance their research capabilities in a top-level research environment.
• The position is available starting from July 2026 onwards.

Workplace

The PhD student will be based at ETH Zurich, which offers an exciting working environment along with opportunities to learn cutting-edge techniques and perspectives for career development within a diverse and interdisciplinary team.

We Value Diversity and Sustainability

In alignment with our core values, ETH Zurich promotes an inclusive culture. We advocate for equality of opportunity, value diversity, and cultivate a working and learning environment that respects the rights and dignity of all our staff and students. Sustainability is also a fundamental principle for us as we strive towards a climate-neutral future.

Curious? So Are We!

We look forward to receiving your online application using the form below. Please include the following documents:

• Motivation letter
• CV
• Transcripts
• Names of two potential references

Only applications matching the job profile will be considered. For further information about the Laboratory of Energy Science and Engineering, please visit our website. Questions regarding the position can be directed to Prof. Christoph Müller via email at muelchri@ethz.ch.

About ETH Zurich

ETH Zurich is a premier university specializing in science and technology, renowned for its outstanding education, pioneering research, and direct transfer of knowledge to society. With over 30,000 individuals from more than 120 countries, ETH Zurich fosters independent thinking and inspires excellence. Located in the heart of Europe while forging international connections, we collaborate to develop solutions for the global challenges of today and tomorrow.