Journal of Shanghai Jiao Tong University ›› 2023, Vol. 57 ›› Issue (S1): 108-113.doi: 10.16183/j.cnki.jsjtu.2023.S1.03
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AN Tao(
), LIN Zengyong, BAI Jian
Received:2022-07-07
Revised:2022-07-25
Accepted:2022-08-22
Online:2023-10-28
Published:2023-11-10
CLC Number:
AN Tao, LIN Zengyong, BAI Jian. Calculation of Towing Resistance of Jack-up Offshore Platform[J]. Journal of Shanghai Jiao Tong University, 2023, 57(S1): 108-113.
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URL: https://xuebao.sjtu.edu.cn/EN/10.16183/j.cnki.jsjtu.2023.S1.03
Tab.1
Environment conditions for calculation of towing resistance in different specifications
| 环境条件 | CCS | DNV | IMO | GL | ABS |
|---|---|---|---|---|---|
| 风速/(m·s-1) | 20 | 20 | 20 | 20 | - |
| 流速/(m·s-1) | 0.5 | 1.0 | 0.5 | ≥0.5 | - |
| 有义波高/(m·s-1) | 5 | 5 | 5 | 5 | - |
| 波浪周期/s | - | 6~9 | - | - | - |
Tab.2
Results of towing resistance obtained by algorithm of Guidance for China Classification Society
| 拖速/kn | 静水阻力/kN | 考虑风阻力/kN | 拖航阻力/kN |
|---|---|---|---|
| 1 | 13 | 1069 | 1069 |
| 2 | 45 | 1089 | 1089 |
| 3 | 99 | 1122 | 1122 |
| 4 | 183 | 1173 | 1173 |
| 5 | 306 | 1247 | 1247 |
| 6 | 482 | 1355 | 1355 |
Tab.3
Results of towing resistance obtained by algorithm of CCS taking into account wave resistance
| 拖速/ kn | 拖航阻力/kN | ||||
|---|---|---|---|---|---|
| 波高1 m | 波高2 m | 波高3 m | 波高4 m | 波高5 m | |
| 1 | 1076.9 | 1086.2 | 1101.8 | 1123.6 | 1151.7 |
| 2 | 1112.3 | 1131.0 | 1162.2 | 1205.9 | 1262.0 |
| 3 | 1169.9 | 1197.9 | 1244.7 | 1310.2 | 1394.4 |
| 4 | 1256.3 | 1293.7 | 1356.1 | 1443.4 | 1555.6 |
| 5 | 1382.0 | 1428.8 | 1506.7 | 1615.9 | 1756.2 |
| 6 | 1562.1 | 1618.3 | 1711.8 | 1842.8 | 2011.2 |
Tab.4
Results of towing resistance obtained by using specification algorithm of Korean Register of Shipping
| 拖速/kn | 拖航阻力/kN |
|---|---|
| 1 | 1405 |
| 2 | 1609 |
| 3 | 1908 |
| 4 | 2302 |
| 5 | 2791 |
| 6 | 3375 |
Fig.1
Schematic diagram of a large jack-up platform
Tab.5
Data of a large jack-up platform
| 参数 | 数值 |
|---|---|
| 船长,L/m | 74.09 |
| 船宽,B/m | 62.78 |
| 型深,D/m | 7.92 |
| 拖航吃水,d/m | 5.18 |
| 方形系数,δ | 0.65 |
| 船舶或水上建筑物的水下湿表面积,A1/m2 | 3676 |
| 浸水部分的船中横剖面积,A2/m2 | 325.2 |
| 形状系数∑Cs×受风面积Ai(按顶风计算)/m2 | 1×172.01+1×593.4+0.5×5060+1.25×445.6+1.5×120+1×68=4100其中受风面积中井架满实系数按0.6,桩腿按等效面积) |
Fig.2
Numerical computation model-platform model
Fig.3
Numerical computation model-computational domain
Fig.4
CFD numerical model-grid
Tab.6
Statistics of total resistance of platform in static water and waves calculated by CFD
| 工况 序号 | 航速条件 | 波高/ m | 周期/ s | X方向 最大值/ kN | X方向 最小值/ kN | 平均值/ kN |
|---|---|---|---|---|---|---|
| 1 | 1 kn静水 | - | - | 11.32 | 11.80 | 11.56 |
| 2 | 2 kn静水 | - | - | 59.3 | 57.9 | 58.6 |
| 3 | 3 kn静水 | - | - | 138.9 | 125.1 | 132.5 |
Fig.5
Numerical model of potential flow (platform model)
Fig.6
Numerical model of potential flow (fluid domain)
Fig.7
Numerical model of potential flow (grid)
Tab.7
Statistics of drift force calculated by potential flow
| 序号 | 有义波高/m | 谱峰周期/s | 二阶漂移力/kN |
|---|---|---|---|
| 1 | 1 | 6 | 34.51 |
| 2 | 2 | 8 | 106.87 |
| 3 | 3 | 8 | 180.52 |
| 4 | 4 | 8 | 240.66 |
| 5 | 5 | 8 | 320.00 |
Tab.8
Hydrodynamic towing resistance at 1 kn
| 波高/m | 风阻力/ kN | 静水阻力/ kN | 绕射效应 增阻/kN | 波浪漂移 力/kN | 拖航总阻 力/kN |
|---|---|---|---|---|---|
| 1 | 1061.3 | 11.56 | 1.31 | 34.51 | 1108.68 |
| 2 | 1061.3 | 11.56 | 7.09 | 106.87 | 1186.82 |
| 3 | 1061.3 | 11.56 | 28.55 | 320.00 | 1421.41 |
Tab.9
Comparison of towing resistance at a towing speed of 1 kn, a wave height of 5 m, and a wind of 20.6 m/s
| 算法 | 拖航阻力/kN |
|---|---|
| CCS拖航指南 | 1069 |
| CCS考虑波浪算法 | 1152 |
| 韩国KR算法 | 1105 |
| 水动力学算法 | 1421 |
Tab.10
Statistics of towing force of towing pillar of a typical platform
| 序号 | 平台名称 | 平台拖航阻力 (风速20 m/s; 波高5 m;流速 0.5 m/s)/kN | 系柱拖力/kN | ||
|---|---|---|---|---|---|
| 油区内 (1.05) | 近海 (1.1) | 跨海域 (1.25) | |||
| 1 | 作业X号 | 36.2 | 38.01 | 39.8 | 45.3 |
| 2 | 作业X号 | 37.1 | 38.96 | 40.8 | 46.4 |
| 3 | 作业X号 | 41.5 | 43.58 | 45.7 | 51.9 |
| 4 | 胜利X号 | 60.2 | 63.21 | 66.2 | 75.3 |
| 5 | 胜利X号 | 86.8 | 91.14 | 95.5 | 108.5 |
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