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Unsteady characteristics of the cavity flow around a rough circular cylinder |
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| Authors: | Takuya Kaga Terukazu Ota |
| Affiliation: | Department of Mechanical Engineering, Hachinohe Institute of Technology, Hachinohe, Japan Department of Machine Intelligence and Systems Engineering, Tohoku University, Sendai, Japan |
| Abstract: | Effects of surface roughness on the unsteady cavitating flow around a two-dimensional circular cylinder were experimentally investigated at Reynolds numbers from 1.36 × 105 to 1.78 × 105. Two patterns of surface roughness were investigated, a double-cut pattern and a single-cut pattern. The cavity elongates with an increase of the surface roughness, especially in supercavitating flow. However, for some roughness parameters tested, the cavity length exhibits an extreme decrease. In a particular case of the double-cut pattern, there exists the minimum cavity behind the cylinder. |
| Keywords: | cavitation unsteady flow flow vibration separation surface roughness circular cylinder time series analysis boundary layer fluid force |
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