Oliveira Dinis, Larsson Ann I, Granhag Lena
a Department of Mechanics and Maritime Sciences , Chalmers University of Technology , Gothenburg , Sweden.
b Department of Marine Sciences , University of Gothenburg , Tjärnö - Strömstad , Sweden.
Biofouling. 2018 Mar;34(3):262-272. doi: 10.1080/08927014.2018.1434157. Epub 2018 Feb 19.
Hull biofouling is a well-known problem for the shipping industry, leading to increased resistance and fuel consumption. Considering that the effects of hull form on resistance are known to be higher for a less slender hull, it is hypothesised in this paper that the effect of biofouling roughness on resistance is also dependent on the hull form. To test this hypothesis, previously reported full-scale numerical results on a containership are re-analysed. Form effects on roughness penalties, corresponding to K = 0.058 ± 0.025, are observed at a low speed (19 knots, Re = 2.29 × 10), which are however cancelled out by traditionally neglected roughness effects on wave-making resistance at a higher speed (24 knots, Re = 2.89 × 10). It is concluded that hull form effects on biofouling penalties can be significant at low speeds, though not generalisable for higher speeds, namely when wave-making resistance corresponds to ≥ 29% of total resistance.
船体生物污损是航运业众所周知的问题，会导致阻力增加和燃料消耗上升。鉴于对于较不细长的船体，已知船体形状对阻力的影响更大，本文提出假设，生物污损粗糙度对阻力的影响也取决于船体形状。为验证这一假设，对先前报道的一艘集装箱船的全尺度数值结果进行了重新分析。在低速（19节，雷诺数Re = 2.29×10）下观察到形状对粗糙度惩罚的影响，对应K = 0.058±0.025，然而在较高速度（24节，雷诺数Re = 2.89×10）下，传统上被忽略的粗糙度对兴波阻力的影响抵消了这种影响。得出的结论是，船体形状对生物污损惩罚的影响在低速时可能很显著，但对于较高速度（即当兴波阻力占总阻力的≥29%时）则不具有普遍性。
