The underwater viscous flow fields around SUBOFF for Reynolds number from 1.327×107 to 2.614×108 were numerically simulated. Effects of Reynolds number on resistance coefficient and form factor were researched through comprehensive comparison between computational results and experimental data. And demands of computational fluid dynamics at high Reynolds number on computational mesh were investigated. Two compensation coefficients related respectively to form factor and residual resistance coefficient were put into forward and the two coefficients were evaluated. It's shown that for general experimental Reynolds number, which is up to 3×107, the value of delta k (Δk) is approximately equal to 7%, that is to say the incremental quantity of form factor due to scale effect of Reynolds number is approximately 7% of experimental value of form factor. And the incremental quantity should be increased when fullscale form factor prediction is done. The value of λCRis approximately equal to 1.25%, that is to say the incremental quantity of resistance coefficient due to scale effect is approximately 1.25% of experimental value of resistance coefficient. And the incremental quantity should be reduced when full-scale resistance coefficient is predicted.

INTRODUCTION

Full-scale resistance prediction of submerged bodies is of important significance for design of submerged bodies. Up to date, prediction of underwater resistance is still mainly depends on experiment. The Semiempirical method is generally applied to the resistance conversion from model-scale to full-scale. The presupposition of conversion is that according to similarity criterion there exists an automatic similarity Reynolds number, and when Reynolds number reaches the critical value the residual resistance coefficient of submerged bodies will not change along with Reynolds number. Since the experimental Reynolds number is generally less than 3×107, while the full-scale Reynolds number is generally more than 2.5×108, the so-called scale effect due to the gap of Reynolds number should be corrected by modifying some coefficients during the course of resistance conversion.

Keywords:
pressure coefficient distribution, reynolds number, prediction, computational result, experimental data, resistance coefficient, form factor, fine mesh, coarse mesh, experimental value
Subjects:
Reservoir Simulation
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2009. The International Society of Offshore and Polar Engineers
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