Roughness effects of diatomaceous slime fouling on turbulent boundary layer hydrodynamics. Murphy, E. A. K., Barros, J. M., Schultz, M. P., Flack, K. A., Steppe, C. N., & Reidenbach, M. A. Biofouling, 34(9):976–988, October, 2018. ![Roughness effects of diatomaceous slime fouling on turbulent boundary layer hydrodynamics [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Biofilm fouling significantly impacts ship performance. Here, the impact of biofilm on boundary layer structure at a ship-relevant, low Reynolds number was investigated. Boundary layer measurements were performed over slime-fouled plates using high resolution particle image velocimetry (PIV). The velocity profile over the biofilm showed a downward shift in the log-law region (ΔU+), resulting in an effective roughness height (ks) of 8.8 mm, significantly larger than the physical thickness of the biofilm (1.7 ± 0.5 mm) and generating more than three times as much frictional drag as the smooth-wall. The skin-friction coefficient, Cf, of the biofilm was 9.0 × 10−3 compared with 2.9 × 10−3 for the smooth wall. The biofilm also enhances turbulent kinetic energy (tke) and Reynolds shear stress, which are more heterogeneous in the streamwise direction than smooth-wall flows. This suggests that biofilms increase drag due to high levels of momentum transport, likely resulting from protruding streamers and surface compliance.
@article{murphy_roughness_2018,
title = {Roughness effects of diatomaceous slime fouling on turbulent boundary layer hydrodynamics},
volume = {34},
issn = {0892-7014},
url = {https://doi.org/10.1080/08927014.2018.1517867},
doi = {10.1080/08927014.2018.1517867},
abstract = {Biofilm fouling significantly impacts ship performance. Here, the impact of biofilm on boundary layer structure at a ship-relevant, low Reynolds number was investigated. Boundary layer measurements were performed over slime-fouled plates using high resolution particle image velocimetry (PIV). The velocity profile over the biofilm showed a downward shift in the log-law region (ΔU+), resulting in an effective roughness height (ks) of 8.8 mm, significantly larger than the physical thickness of the biofilm (1.7 ± 0.5 mm) and generating more than three times as much frictional drag as the smooth-wall. The skin-friction coefficient, Cf, of the biofilm was 9.0 × 10−3 compared with 2.9 × 10−3 for the smooth wall. The biofilm also enhances turbulent kinetic energy (tke) and Reynolds shear stress, which are more heterogeneous in the streamwise direction than smooth-wall flows. This suggests that biofilms increase drag due to high levels of momentum transport, likely resulting from protruding streamers and surface compliance.},
number = {9},
urldate = {2019-07-16},
journal = {Biofouling},
author = {Murphy, Elizabeth A. K. and Barros, Julio M. and Schultz, Michael P. and Flack, Karen A. and Steppe, Cecily N. and Reidenbach, Matthew A.},
month = oct,
year = {2018},
pmid = {30602310},
keywords = {\#nosource, Biofilm, PIV, boundary layer, drag, roughness, turbulence},
pages = {976--988},
}
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