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PhD Position in Sensorless Transition-delay in Boundary Layers, Eindhoven University of Technology (TU/e)

The reduction of the viscous drag force exerted on thin bodies (e.g. wings and blades) moving in a fluid is of great technical interest (for example for drag reduction of airplanes or optimization of gasturbines). One of the mayor keys to drag-reduction is the delay of transition to turbulence in the boundary layer. Due to the local nature of transition and the rapid nature of breakdown a sensorless (open-loop) strategy is highly preferable, since it prevents the necessity of large numbers of fast sensor/actuator combinations. Thus far, the success of the delay-techniques on boundary layer flows with noise is limited and for bypass-transition none of the strategies has been successful.

In this PhD-project a detailed experimental and numerical study of the mechanisms to delay the transition in a boundary layer will be performed on three modal-based options:
* Upstream traveling waves (UPTW)
* Spanwise traveling waves (SPTW)
* Delay by streaks (DBS)

The combination of experimental work supported by numerical simulations in this field is imperative. Therefore, this PhD-project will be performed as a cooperation project in the existing collaboration between TU/e and KTH. DNS/LES simulations (at KTH) are used to open the opportunity to optimize the transition-delay, i.e. to ‘continuously’ vary the input wave-number or streak-configuration, while experiments (at TU/e) will show the delay-effect on a much larger (non-periodic) physical domain and (for instance) also give information on leading edge behavior. Furthermore, the experiments will provide the essential proof of the practical applicability of the proposed techniques.

The candidate will be appointed at the TU/e, faculty of Mechanical Engineering in a joint project between TU/e (75%) and KTH (25%). The project is performed within the frame-work of the bi-promotion agreement between TU/e and KTH, which means that the candidate is admitted to take his/her doctoral degree on both universities.

For information and application, please contact H.C. de Lange: h.c.d.lange@tue.nl
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