Experimental and Theoretical Study of the Effect of Hull Roughness on Ship Resistance

Hull roughness increases ship frictional resistance and, thus, results in economic and environmental penalties. Its effect has been prevalently predicted using the similarity law scaling procedure. However, this method not yet validated with experimental data a model ship. This study presents an investigation into of on provides validation scaling, by tank testing flat plate Both were tested smooth rough surface conditions, respectively. For sand grit (aluminum oxide abrasive powder) was applied surfaces model. The functions derived obtained from tests. Using function towing test, extrapolated to length following total first result model, then compared coefficients for showed good agreement measured coefficient thus proving validity Granville’s extrapolate resistance.