Intermittent, side-to-side switching of the gap flow downstream of two side-by-side flat plates was studied for gap ratios between 1·50 and 1·85. On the side of the gap to which the flow is deflected, called the narrow-wake side, periodic vortex shedding is detected at the outer edges of the wake shear layer and the gap flow. On the other side, called the wide-wake side, no periodic vortex shedding is measured; instead flow developing in the near wake region is characterized by turbulent fluctuations. A specially designed data reduction scheme was developed in this work to detect the instant of gap flow switching. It is found that the number of events of gap flow switching increases with the gap ratio, and the statistics of time intervals between neighboring switching events appears to be a Poisson distribution.
All Science Journal Classification (ASJC) codes
- Mechanical Engineering