Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder

DY 57.2: Vortrag

Donnerstag, 10. März 2016, 15:30–15:45, H46

Percolation model for laminar-turbulent transition of a boundary layer: experimental insight by Particle Image Velocimetry — •Tom Wester, Dominik Traphahn, Pedro G. Lind, Gerd Gülker, and Joachim Peinke — Carl von Ossietzky University, Oldenburg, Germany

The boundary layer’s transition from laminar to turbulent is a very complex process, which at present is not fully understood. In order to fully capture this complexity with a very limited number of characteristic stochastic properties, this experimental study aims at describing the phase transition by means of the directed percolation model.
In contrast to the majority of previous studies, the underlying data base is acquired experimentally by high-speed Particle Image Velocimetry. Thus, a boundary layer evolving on a flat plate can be captured in a highly resolved spatio-temporal manner. In this way, sufficient data is provided to determine critical probabilities and critical exponents which describe the transient area between laminar and turbulent boundary layer within the scope of directed percolation. First results from this approach will be presented and compared to theoretical expectations.