3. Computation of Ship's Resistance Using an NS Solver with Global Conservation : Flat Plate and Series 60 (C_B=0.6) Hull

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A globally conservative NS sover for flow past a ship hull has been developed. It uses a 3rd-order accurate upwind differencing of the preprocessing (MUSCL) type for inviscid terms, in which the non-uniformity of grid spacing is taken into account. Using the solver, the drag of a flat plate at zero incidence was computed in the Reynolds number range R_e= 4.0×10^5〜4.0×10^7. The dependence of the drag on the degree of clustering of grid points was checked. The computed drag agreed with the Schoenherr value within 4 %. An appropriate criterion for the minimum grid spacing Δ_<min> adjacent to solid wall with this particular scheme seems to be [numerical formula]. Then the drag of the Series 60 (C_B=0.6) ship hull with the double model flow assumption was computed in the same Reynolds number range using grids with various Δ_<min> and various degree of clustering toward bow and stern. Although the computed drag values showed some scattering due to the difference in grids, the results with the smallest Δ_<min> agreed well with the measured values throughout the Reynolds number range
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