Abstract： A flat plate was studied for the validation of the numerical method in high Reynolds number condition, based on which, the viscous flow field of different scale model including full scale ship of DTMB5415 bare and appendaged hull were solved numerically by RANS (Reynolds Averaged Navier-Stokes) method and SST k－ω (Shear-Stress Transport k-ω) turbulence model without considering the free surface effect, and the scale effect of appendage resistance of twinscrew ship was analyzed in detail. It shows that the scale effect is quite different for individual appendages. The scale effect of appendage resistance cannot be ignored due to the large proportion in total resistance for twinscrew ship. The appendage resistance correction factor was introduced for the extrapolation of appendage resistance from model scale to full scale ship, and it is found that the cubic polynomial function is fit perfectly for the relationship of the appendage resistance correction factor and the Reynolds number in the logarithmic scales.
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