Abstract
Regarding the effect on the skin friction resistance of the wavy roughness like a painted surface on the hull surface, the law for the sandy rough surface cannot be applied, and it is impossible to estimate the quantity of the frictional resistance change from the roughness parameter. In order to investigate the influence on the frictional resistance with the fluid due to the wavy rough surface, the frictional resistance of flat plates with painted rough surface of different wave length wave height ratio was measured by tank tests. And, by measuring the surface roughness of painted roughness flat plates with a laser displacement meter, the roughness shape parameter was obtained. By analyzing these tank test results and roughness shape parameters and clarifying the relationship between the roughness parameter and the frictional resistance, we proposed a hypothesis about the frictional resistance increasing mechanism by the wavy rough surface, and based on the hypothesis, the frictional drag coefficient estimation formula was derived.
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