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Technische Universität Braunschweig
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PhD Doctoral Candidate in Experimental and Numerical Study of Liquid Sheet Jets for Active Flow Control Technische Universität Braunschweig in Germany
Degree Level
PhD
Field of study
Mechanical Engineering
Funding
This is a full-time, fixed-term 36-month position starting March 1, 2027. The position is paid according to the TV-L collective agreement and includes a special year-end payment, supplementary company-pension benefits, and 30 days of annual vacation.
Deadline
Dec 15, 2026
Country
Germany
University
Technische Universität Braunschweig
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About this position
The Institute of Fluid Mechanics at Technische Universität Braunschweig is offering a doctoral research opportunity in the experimental and numerical study of liquid sheet jets for active flow control.
The project is part of the DFG-funded research project Superior Flow Control through Liquid-Sheet Jets. It investigates thin, wide water jets injected into an air crossflow and their potential to replace pressurised air in active flow-control systems for future hydrogen fuel-cell aircraft. The research addresses the instabilities, breakup regimes, flow topology, and control performance of liquid-sheet jets, which remain less explored than round liquid jets in crossflow.
The doctoral researcher will work across experimental fluid mechanics and computational fluid dynamics. Activities include generating uniform liquid-sheet jets, developing optical measurement methods, and characterising jet breakup and the surrounding flow field. Experimental work will involve laser-induced fluorescence, laser scanning, particle tracking velocimetry, high-speed imaging, event-based imaging, and wind-tunnel testing in the Braunschweig Icing Wind Tunnel using a flat-plate model with an adjustable streamwise pressure gradient.
The computational component includes multiphase RANS simulations with volume-of-fluid and adaptive-mesh-refinement methods in ANSYS Fluent, together with high-fidelity direct numerical simulations using the open-source Basilisk software. The researcher will conduct parameter studies involving Weber and Reynolds numbers, momentum flux ratio, aspect ratio, and normalized pressure gradient, then classify breakup regimes and develop flow-control performance maps.
The position is embedded in an internationally recognized research group in experimental and computational fluid mechanics, with access to advanced multiphase-flow facilities, environmental testing infrastructure, and state-of-the-art optical diagnostics. The doctoral researcher will also publish findings in leading journals, present at international conferences, and contribute to teaching and supervision activities.
Funding details
This is a full-time, fixed-term 36-month position starting March 1, 2027. The position is paid according to the TV-L collective agreement and includes a special year-end payment, supplementary company-pension benefits, and 30 days of annual vacation.
What's required
Applicants must hold a Master's degree in Aerospace Engineering, Mechanical Engineering, Physics, Applied Mathematics, or a related field. Strong interest in fluid mechanics and multiphase flows, experience with laboratory experiments and data analysis, programming skills in Python, MATLAB, or similar environments, strong analytical skills, and the ability to work independently are required. Good written and spoken English is required. Knowledge of optical measurement techniques such as PIV, particle tracking, high-speed imaging, and image processing is advantageous, as is CFD experience with tools such as ANSYS Fluent or Basilisk, ideally involving multiphase-flow simulations.
How to apply
Submit a CV, transcripts, motivation letter, and a copy of your Master's thesis or comparable scientific document, preferably as one PDF, by email to [email protected]. Applications may also be sent by post to the Institute of Fluid Mechanics at Hermann-Blenk-Straße 37, 38108 Braunschweig, Germany.
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