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In order to fill a fixed-term position in part-time (29.87 hours/week = 75%) at the earliest possible date or July 1, 2026, we are looking for a

PhD-Position (m/f/x) at ICAMS, Ruhr-University Bochum: Lattice-Boltzmann-based simulations of reactive flows through particle beds

The Complex Fluids Group at ICAMS, Ruhr University Bochum, investigates structure–property relationships in soft matter systems such as polymers, colloids, and suspensions, combining theoretical modeling with large-scale molecular simulations. Its research focuses on flow behavior, phase transitions, and non-equilibrium phenomena, with particular relevance to advanced materials design and processing. The group also has strong expertise in lattice Boltzmann modeling combined with machine-learning-based approaches for simulating complex reactive fluid flows and hydrodynamic interactions across multiple length and time scales.

As a research assistant (m/f/x), you will independently develop highly efficient, massively parallel (GPU/CPU) lattice-Boltzmann-based numerical solvers for the transport and chemical reactions of gases and solids under flow conditions and implement the resulting code into the existing simulation software OpenPhase (http://www.openphase.rub.de). You will be embedded in a large collaborative research network between Ruhr University Bochum and Otto von Guericke University Magdeburg (SFB-TRR 287, Bulk Reaction), providing an excellent opportunity to further develop your research profile and establish yourself in an academic environment

Scope: part-time
Duration: fixed-term, 36 Monate
Start: at the earliest possible date or July 1, 2026
Apply by: 2026-04-20

Your tasks:

1. Numerical modelling of chemical reactions between the solid and the surrounding gas.
2. Coupling between the flow solver and the phase-field method to account for interface kinetics during solid–gas reactions.
3. Optimization and parallelization of the code for efficient execution on GPU/CPU architectures.
4. Verification and validation of numerical methods against analytical solutions and/or experimental data.
5. Integration of newly developed models and algorithms into the simulation framework OpenPhase.
6. Presentation of results in project meetings, conferences and scientific publications.

Your profile:

Master’s degree or Diploma in Computational Engineering, Chemical Engineering, or Theoretical Physics; familiarity with combustion equations, fluid dynamics, turbulent flows, advection-diffusion and reaction equations, mass and heat transport, as well as laminar and turbulent flows.

In addition, given the software-engineering challenges of the project, experience in computer programming is essential. Successful completion of the project also requires the ability to simplify the underlying equations and to predict qualitative trends prior to performing computer simulations.

Experience with numerical methods for solving partial differential equations as well as with lattice-Boltzmann and phase-field methods would be advantageous but is not mandatory.

https://jobs.ruhr-uni-bochum.de/jobposting/230f397cb574eb7a4fdb4ca5eed126ecc222519c0?ref=AfA