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An experimental study of unsteady behaviour of cavity flow over a 2-D wall-mounted fence
| Content Provider | Semantic Scholar |
|---|---|
| Author | Barbača, Luka Pearce, Bryce W. Brandner, Paul A. Ganesh, H. B. Bharathi Ceccio, Steven L. |
| Copyright Year | 2018 |
| Abstract | The unsteady behaviour of ventilated and natural cavity flows over a 2-D wall-mounted fence is investigated for fixed length cavities with varying free-stream velocity using still imaging, X-ray densitometry and dynamic surface pressure measurement in two experimental facilities. Cavities in both ventilated and natural flows were found to have a re-entrant jet closure, but not to exhibit large-scale oscillations, rather irregular small-scale shedding at the cavity closure. Small-scale cavity break-up was associated with a high-frequency broad-band peak in the wall pressure spectra, found to be governed by the overlying turbulent boundary layer characteristics, similar to observations from single-phase flow over a forward-facing step. A low-frequency peak reflecting the oscillations in size of the re-entrant jet region, analogous to ‘flapping’ motion in single-phase flow, was found to be modulated by gravity effects (i.e. a Froude number dependence). |
| Starting Page | 66 |
| Ending Page | 71 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| DOI | 10.1115/1.861851_ch14 |
| Alternate Webpage(s) | https://cav2018.jhu.edu/wp-content/uploads/Barbaca-Luka.pdf |
| Alternate Webpage(s) | https://doi.org/10.1115/1.861851_ch14 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
