PhD Contact group

Currently, I am involved in the PhD contact group representing the  Laboratory for Aero and Hydrodynamics of the faculty  Mechanical Engineering of the TU Delft. As a PhD student, my research interest is aeroacoustic and in particular the noise emission by air flows interacting with solid boundaries. Recently I focused my attention on the acoustic emissions by the fl ow over a rectangular cavity. Especially, I investigate the possibility of estimating the acoustic emission by analysis of PIV data. Such a possibility is appealing since it may allow to directly relate the fl ow behavior to the produced noise. This will help considerably in understanding the noise production mechanisms and to investigate the possible ways of reducing it. I study the problem combining high speed two-dimensional PIV imaging, wall pressure measurements and sound measurements. The pressure  field is calculated from the PIV data and an acoustic analogy is applied to obtain the acoustic pressure  field. The pressure measurements on the wall of the cavity and the sound measurements are used to validate the results obtained from PIV and check the range of validity of this approach.

Valentina Koschatzky | v.koschatzky@tudelft.nl | 015 278 2861
Lab for Aero and Hydrodynamics

 

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Important focus of the group: morphodynamics of marine and fluvial systems. My PhD-project deals with process-based modeling of sediment transport under waves in the sheet-flow regime. Under highly energetic wave conditions a layer with a high concentration of sediment moves along the bottom. By developing and studying a validated process-based numerical model for sand transport under progressive surface wave we try to gain insight in the effects of various processes on transport rates and flux-profiles. Relevant processes are e.g. the generation of net currents in the bottom boundary layer by surface waves and the entrainment and settling of sediment.

Wouter Kranenburg | w.m.kranenburg@utwente.nl | 053 489 2959
Water Engineering & Management

I represent the PhD students and postdocs of the computational mechanics and numerical mathematics group of Arthur Veldman, Groningen University. Under the supervision of Fred Wubs (Groningen) and Henk Dijkstra (IMAU, Utrecht). I am working on advanced numerical methods for fully implicit ocean models. To this end I am aiming at three classes of improvements to existing techniques:
- parallelization and advanced multi-level methods,
- a technique for continuation and bifurcation analysis of periodic solutions,
- a two-level method for rapid inexact time integration to reach statistical equilibrium solutions.
By bringing together recent developments in scientific computing and physical oceanography we hope to improve the understanding of the fundamental mechanisms of ocean dynamics and thus contribute to climate research.

Jonas Thies | j.thies@rug.nl | 050 363 6474
Mathematics and Computer Science

I am involved in the PhD contact group representing the Applied Molecular Physics group of the Institute for Molecules and Materials (IMM) of Radboud University Nijmegen which is in collaboration with Fluid Mechanics group of Technical University Eindhoven. My research is concerned with an experimental investigation of the transition from molecular to turbulent dispersion and the probable interference between them. I investigate turbulent mixing phenomena on very small scales (smaller than the Kolmogorov length scale η ) to consider the effects of molecular diffusion and turbulent dispersion more precisely. Turbulent mixing is basically everywhere in our everyday life; companies designing and building cars need to know exactly how the shape of their car influences the interaction of the car with the air that it moves through, in order to improve fuel consumption and reduce friction. In other application like for the construction of an aircraft, the knowledge maybe even more important, since this information
will keep planes in the air!

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