Effects of superhydrophobic surfaces on turbulent boundary layer induced vibration and drag - Report Year 3

The specific objective of the project was to perform experimental tests at high Reynolds number, on water repellent materials, focused on resistance and vibration measurements, to assess their ability to reduce the hydrodynamic drag and to modify the vibrational response of elastic structures excited by turbulent boundary layers. In the experimental test, fundamental parameters were varied to collect accurate information on the effects of (i) material (substrate) roughness or surface geometry, (ii) flow velocity hence, on Reynolds number and, (iii) viscosity of the lubricant (air and oil), on the material performances. The approach included also an analysis of the material's properties in terms of time durability. Specific feedback actions on coatings and materials design, in order to improve their behaviour and the related performances were major project's objectives as well.