Research Article
Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon
Table 16
Computed resistance, trim, and heave for different longitudinal locations of step at three different speeds.
| Case | Distance of transom (mm) | | 8 m/s | 9 m/s | 10 m/s | R/Δ | Trim (deg) | Z/V0.33 | R/Δ | Trim (deg) | Z/V0.33 | R/Δ | Trim (deg) | Z/V0.33 |
| 1 | 500 | 19 | 0.1616 | 4.5 | 0.191 | 0.1652 | 3.8 | 0.1963 | P | P | P | 2 | 620 | 23 | 0.16116 | 4.5 | 0.189 | 0.1652 | 3.8 | 0.196 | P | P | P | 3 | 670 | 25 | 0.16116 | 4.3 | 0.185 | 0.1636 | 3.78 | 0.1941 | 0.172 | 3.55 | 0.20 | 4 | 720 | 27 | 0.16116 | 4.09 | 0.178 | 0.1683 | 3.62 | 0.191 | 0.174 | 3.19 | 0.19 | 5 | 770 | 29 | 0.1659 | 4 | 0.176 | 0.1668 | 3.5 | 0.189 | 0.1768 | 3.1 | 0.194 | 6 | 820 | 31 | 0.1669 | 3.8 | 0.171 | 0.1683 | 3.4 | 0.186 | 0.180 | 2.8 | 0.191 | 7 | 870 | 33 | 0.1673 | 3.78 | 0.169 | 0.1683 | 3.3 | 0.183 | 0.1826 | 2.6 | 0.185 | 8 | 970 | 37 | 0.1680 | 3.7 | 0.164 | 0.1683 | 3.2 | 0.180 | 0.1884 | 2.6 | 0.182 | 9 | 1120 | 42 | 0.1732 | 3.5 | 0.160 | 0.177 | 3.16 | 0.177 | 0.2039 | 2.5 | 0.18 | 10 | 1320 | 50 | 0.1813 | 3.5 | 0.151 | 0.191 | 2.8 | 0.164 | 0.280 | 2.2 | 0.169 |
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