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Research Assistant
vor 4 Monaten
**Technische Universität Braunschweig**
**Institut für Strömungsmechanik | Exzellenzcluster SE²A**
**Hermann-Blenk-Str. 37 | 38108 Braunschweig**
**Announcement of the position of a**
**research assistant (M/F/d, full time)**
**on the topic**
**"Sensitivities of Laminar Suction Boundary Layers for Large Re"**
**(starting ASAP - temporary position, ends December 31st 2025)**
**Background**
The Institute of Aerodynamics and Flow Technology (AS) at DLR in Braunschweig and the Institute of
Fluid Mechanics (ISM) at TU Braunschweig are conducting joint research in the Cluster of Excellence
SE²A on the stability of laminar suction boundary layers at large Reynolds numbers. In particular, it is of
interest whether and how a boundary layer can be kept laminar over extremely long distances by means
of successively arranged suction regions and how this can be done efficiently. For this purpose, the
stability behaviour of the boundary layer with and without suction must be precisely understood, including
the areas just at the beginning and just after the end of a suction panel. Furthermore, perturbations
(especially steps in the surface) could play a major role and therefore the interaction of the boundary
layer and the unstable modes with steps must also be understood.
Fig.1: Current setup of the flat plate Fig.2: Planned setup with two suction panels
in wind tunnel DNW-NWB (grey areas) in a tandem arrangement
For this purpose, two complementary methods will be used in subproject B1.5:
On the one hand, the Tollmien-Schlichting modes shall be investigated with two-dimensional direct
numerical simulations (DNS) [1]. From the simulations, the stability behavior (amplification and damping
rates) will be determined. Of particular interest are the areas where the boundary layer properties change
in streamwise direction, i.e. the beginning and the end of the suction areas and in the surroundings of
steps.
On the other hand, an experimental setup with a large flat plate, which is available for the DNW-NWB
wind tunnel [2], shall be modified and used in several experimental entries. The configuration with the
two successive suction panels ("tandem configuration") is to be designed, the construction of the
hardware is to be coordinated, and the instrumentation, setup in the wind tunnel, and measurements are
to be planned and executed.
In summary, the tasks are:
- Planning, setup and execution of measurement campaigns with a large flat plate in the wind tunnel
DNW-NWB, including necessary preparations
- Preparation of stability calculations with different tools, up to 2D DNS simulations
- Evaluation and overall analysis of the data, comparison and interpretation of results
- Documentation and presentation of the data and results in internal symposia, at technical
conferences and in peer-reviewed journal publications.
**TU Braunschweig and Cluster of Excellence SE²A**
The project is part of the Cluster of Excellence SE²A, more specifically in ICA B “Flight Physics and
Vehicle Systems”, located at TU Braunschweig.
With 17,800 students and 3,800 employees, the Technische Universität Braunschweig is the academic
centre of Braunschweig, the traditional "City of Science" in the middle of one of the most active research
regions in Europe. We, the Institute of Fluid Mechanics, are part of the Aeronautics Research Centre
Niedersachsen (NFL). The NFL is a leading research centre for aviation in Germany with excellent
research and education. As part of the NFL, we have an internationally unique infrastructure with research
aircraft, wind tunnels, simulators and test rigs with which our scientists and dedicated students conduct
cutting-edge research. A major focus of current research at the NFL and TU Braunschweig is the mobility
needs of society in the future and, in particular, the factors of environmental compatibility, safety and
economic efficiency of air transport. This focus is also reflected in the goals of the Cluster of Excellence
SE²A on Sustainable and Energy-Efficient Aviation, awarded to TU Braunschweig by the German
Research Foundation (DFG) in 2019. The Cluster of Excellence SE²A is an interdisciplinary research
centre with the purpose of investigating technologies for a sustainable and eco-friendly air transport
system. Scientists from aerospace, electrical, energy and chemical engineering are working on the
reduction of emissions and noise, as well as recycling and life-cycle concepts for airframes and
improvements in air traffic management. Technische Universität Braunschweig, the German Aerospace
Centre (DLR), Leibniz University Hannover (LUH), Braunschweig University of Art (HBK) and the National
Metrology Institute of Germany (PTB) have joined forces in this extraordinary scientific undertaking.
**Requirements**:
- received an above-average completed university degree (master or equivalent) in mechanical
engineering, aerospace engineering, applied physi
