Postdoctoral Fellow in AI-enhanced modelling of boiling multiphase flows

31 January 2026
100%
Permanent position
Villigen PSI

Job summary

The Paul Scherrer Institute PSI is Switzerland's leading research hub. Join us for innovative projects in energy, health, and more!

Tasks

Develop GPU-accelerated Lattice Boltzmann code for nuclear reactor flows.
Implement AI/ML models for bridging multiphase flow codes.
Co-develop, benchmark, and validate new codes for research.

Skills

PhD in Mechanical, Nuclear, or Environmental Engineering required.
Experience in fluid dynamics and multiphase flow modeling essential.
Strong programming skills in C/Cuda/Python needed.

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About the job

The Paul Scherrer Institute PSI is the largest research institute for natural and engineering sciences within Switzerland. We perform cutting-edge research in the fields of future technologies, energy and climate, health innovation and fundamentals of nature. By performing fundamental and applied research, we work on sustainable solutions for major challenges facing society, science and economy. PSI is committed to the training of future generations. Therefore, about one quarter of our staff are post-docs, post-graduates or apprentices. Altogether, PSI employs 2300 people.

For the Laboratory for Waste Management – Transport Mechanics group and within the scope of a research project funded by SwissNuclear we are looking for a

Your tasks

Develop and extend the in-house GPU-accelerated multiphase Lattice Boltzmann (LBM) code for DNS-grade boiling multiphase flow related to nuclear reactor operation, including bubble dynamics and wall interaction phenomena

Implement AI/ML models and multiscale coupling procedures to bridge the lattice Boltzmann codes with a two-fluid Eulerian macroscopic code

Co-development of codes, including benchmarking and validation

Publication of results in journals and conferences

Your profile

We are looking for a team player able to work independently with

PhD degree in Mechanical or Nuclear Engineering / Natural Sciences / Environmental Sciences

Experience in modelling fluid dynamics and multiphase flows (ideally with lattice Boltzmann method)

Strong experience in programming (C/Cuda/Python). Familirarity with AI/ML methods for scientific computing and openness to explore different approaches

Very good command of English is required (spoken and written)

We offer

Our institution is based on an interdisciplinary, innovative and dynamic collaboration. You will profit from a systematic training on the job, in addition to personal development possibilities and our pronounced vocational training culture. If you wish to optimally combine work and family life or other personal interests, we are able to support you with our modern employment conditions and the on-site infrastructure.

Employment contract is initially limited to 2 years, with possible extension depending on the performance and future project availability.

For further information, please contact Dr Nikolaos Prasianakis, phone +41 56 310 24 15.

Please submit your application online by 6 March 2026 (including list of publications and addresses of referees) for the position as a Postdoctoral Fellow (Index-Nr. 4403-26147).

Paul Scherrer Institute, Human Resources Management, Pascale Bärtschi, 5232 Villigen PSI, Switzerland

www.psi.ch