PhD Position on The Delft Laminar Hump “Running up that Hill”: Enabling ultra-efficient wings with the Delft Laminar Hump

Job description About the project: The transition of airflow from laminar to turbulent state is a major contributor to aerodynamic drag and consequently aircraft emissions. Often, unavoidable modifications of the wing surface, such as panel joints or skin deformations decrease the extent of laminar airflow by promoting transition. However, through our research, we showed that this is not always the case. In a recent breakthrough, our team discovered the “Delft Laminar Hump”, a passive smooth surface modification. The proof-of-concept experiments showed the capability of the Hump to create an unprecedented delay of transition, effectively increasing the extent of laminar flow. The “Running up that Hill” project aims at achieving a clear physical understanding of the interaction between laminar-turbulent transition and surface modifications such as the Delft Laminar Hump. The fundamental and technical outcomes of this work will position Hump-like surface modifications as an enabling technology for curbing environmental emissions of aviation. In addition to fundamental work, the project is supported by leading aerospace partners such as KLM, DNW, and Deharde as well as by world-leading groups at U. Waterloo, Canada and KTH, Sweden. Opportunities for research stays with these organisations will be available within the project. We are seeking an enthusiastic and skilled PhD candidate to join our team and work on this exciting project. The PhD project will encompass theoretical and numerical modelling, necessary to simulate and optimise the effect of surface modifications on swept wing transition. Particular emphasis will be given to adjoint-based optimisation due to the large number of design parameters, versus a small number of cost functions, such as transition location. Flow stability analysis tools available in our team can be used, including Orr-Sommerfeld solvers, linear/non-linear Parabolised Stability Equations and our non-linear Harmonic Navier-Stokes solver. An extensive validation effort will involve high-fidelity Direct Numerical Simulations, in collaboration with the group at KTH Stockholm (Prof. D. Henningson and Dr. A. Hanifi). Research stays at KTH will be covered by the project. Job requirements You should meet the following requirements: MSc degree in mechanical or aerospace engineering, applied physics or applied mathematics. Background and affinity in fluid mechanics (e.g. MSc thesis on a fluids-related topic). Good track record in BSc and MSc degrees. Proficiency in the English language, both oral and written. Strong motivation towards pursuing a PhD and willingness to develop diverse skills. Enthusiastic about working in an energetic team and in close collaboration with other researchers. The following skills are also highly appreciated: Affinity with flow stability and transition theory and modelling Experience with adjoint flow solvers and optimisation Experience with high-fidelity numerical simulations