Conference paper Open Access

Three dimensional flow dynamics beneath the air-water interface

Engelmann, Dirk; Garbe, Christoph; Stöhr, Michael; Jähne, Bernd

The physical relation between shape of the surface, flow dynamics beneath the surface and related exchange processes such as gas transfer are not well understood. In order to gain insight into the dynamics of three dimensional flow fields close the air/sea shear layer we present a stereo particle tracking velocimetry method.
The well established particle tracking velocimetry for two dimensional image sequences is combined with a stereo correlation algorithm. The stereo correlation is applied to the trajectories extracted from each image sequence of the stereo camera setup. Particle features can be extracted not only from one single image but from the whole sequence. These are then used in the correlation process, thus making the algorithm more efficient. A precise sub pixel calibration allows quantitative study of the properties of the flow field. Only two cameras are needed and therefore this method simplifies the experimental setup compared to multiple camera setups. Stereo particle tracking was applied for flow field investigations in a wind-wave flume and in a gas liquid reactor.

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