Figure 3 - uploaded by Merel Verbeek
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a-c) Time sequence of 3-second averaged flow velocity. A large vortex (indicated with the yellow arrow) is shed from the upper pillar. Smaller structures are present in the flow downstream the HATTs (in the middle).
Source publication
Large scale Particle Image Velocimetry (PIV) can be of great use to quantify the surface flow velocities of highly turbulent environmental flows. Preliminary results show that the turbulent flow scales of a jet downstream a semi-open barrier can be quantified using unseeded PIV. The technique, executed with a digital camera, can produce sufficientl...
Contexts in source publication
Context 1
... the 5 m depth difference between the PIV and ADCP-measurements. The calculated velocity vectors amounts to approximately 1.5 ms −1 in jets of the neighbouring gates and and approximately 1 ms −1 in the wake of the pillars (see Fig. 2). In a time sequence of the vectors the shedding process of the large vortex structures from the barrier pillars (Fig. 3) can be observed. The length scales can be separated from the smaller fluctuations downstream the HATTs (at the centre of Fig. 3). Future work will focus on the characterization of these different vortex structures resulting from both the barrier and the HATTs and identify their length scales and turbulent transports. ...
Context 2
... −1 in jets of the neighbouring gates and and approximately 1 ms −1 in the wake of the pillars (see Fig. 2). In a time sequence of the vectors the shedding process of the large vortex structures from the barrier pillars (Fig. 3) can be observed. The length scales can be separated from the smaller fluctuations downstream the HATTs (at the centre of Fig. 3). Future work will focus on the characterization of these different vortex structures resulting from both the barrier and the HATTs and identify their length scales and turbulent transports. ...