On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow
A case study is conducted for a submerged floating tunnel module (SFTM) in wet tow conditions. Inspired by the successful wet tow operations of spar platforms, a wet tow scenario is examined where a tunnel module, floating horizontally with a half-diameter draft, is towed by tugboats using towlines....
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MDPI AG
2025-01-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/13/1/77 |
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| author | Ikjae Lee Chungkuk Jin Sung-Jae Kim Moohyun Kim |
| author_facet | Ikjae Lee Chungkuk Jin Sung-Jae Kim Moohyun Kim |
| author_sort | Ikjae Lee |
| collection | DOAJ |
| description | A case study is conducted for a submerged floating tunnel module (SFTM) in wet tow conditions. Inspired by the successful wet tow operations of spar platforms, a wet tow scenario is examined where a tunnel module, floating horizontally with a half-diameter draft, is towed by tugboats using towlines. To evaluate the static stability of the SFTM during wet tow, numerical static offset tests are performed at varying tow speeds to determine the equivalent system stiffness. These static offset tests consider surge, sway, roll, and yaw motions. Statistical analyses are subsequently performed based on the encounter-frequency approximation with varying equivalent stiffnesses. The most probable extreme motion analysis for 3 h under sea state 4 (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>H</mi><mi>S</mi></msub><mo>=</mo><mn>2.44</mn><mtext> </mtext><mi mathvariant="normal">m</mi></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>T</mi><mi>P</mi></msub><mo>=</mo><mn>8.1</mn><mtext> </mtext><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>) shows that the beam sea condition causes the largest heave (0.6 m), and the stern sea (30 deg.) leads to the largest yaw response (0.85 deg.), which is likely to cause an instantaneous decrease in towing stability. |
| format | Article |
| id | doaj-art-1293a2f83e734306a3879194d6b8a6bd |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-1293a2f83e734306a3879194d6b8a6bd2025-01-24T13:36:47ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-01-011317710.3390/jmse13010077On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet TowIkjae Lee0Chungkuk Jin1Sung-Jae Kim2Moohyun Kim3Department of Ocean Engineering, Texas A&M University, College Station, TX 77845, USADepartment of Ocean Engineering and Marine Sciences, Florida Institute of Technology, Melbourne, FL 32901, USAFisheries Engineering Division, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDepartment of Ocean Engineering, Texas A&M University, College Station, TX 77845, USAA case study is conducted for a submerged floating tunnel module (SFTM) in wet tow conditions. Inspired by the successful wet tow operations of spar platforms, a wet tow scenario is examined where a tunnel module, floating horizontally with a half-diameter draft, is towed by tugboats using towlines. To evaluate the static stability of the SFTM during wet tow, numerical static offset tests are performed at varying tow speeds to determine the equivalent system stiffness. These static offset tests consider surge, sway, roll, and yaw motions. Statistical analyses are subsequently performed based on the encounter-frequency approximation with varying equivalent stiffnesses. The most probable extreme motion analysis for 3 h under sea state 4 (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>H</mi><mi>S</mi></msub><mo>=</mo><mn>2.44</mn><mtext> </mtext><mi mathvariant="normal">m</mi></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>T</mi><mi>P</mi></msub><mo>=</mo><mn>8.1</mn><mtext> </mtext><mi mathvariant="normal">s</mi></mrow></semantics></math></inline-formula>) shows that the beam sea condition causes the largest heave (0.6 m), and the stern sea (30 deg.) leads to the largest yaw response (0.85 deg.), which is likely to cause an instantaneous decrease in towing stability.https://www.mdpi.com/2077-1312/13/1/77submerged floating tunnelwet towstabilityseakeepingencounter-frequency |
| spellingShingle | Ikjae Lee Chungkuk Jin Sung-Jae Kim Moohyun Kim On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow Journal of Marine Science and Engineering submerged floating tunnel wet tow stability seakeeping encounter-frequency |
| title | On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow |
| title_full | On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow |
| title_fullStr | On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow |
| title_full_unstemmed | On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow |
| title_short | On the Static Stability and Seakeeping Performance of a Submerged Floating Tunnel Module in Wet Tow |
| title_sort | on the static stability and seakeeping performance of a submerged floating tunnel module in wet tow |
| topic | submerged floating tunnel wet tow stability seakeeping encounter-frequency |
| url | https://www.mdpi.com/2077-1312/13/1/77 |
| work_keys_str_mv | AT ikjaelee onthestaticstabilityandseakeepingperformanceofasubmergedfloatingtunnelmoduleinwettow AT chungkukjin onthestaticstabilityandseakeepingperformanceofasubmergedfloatingtunnelmoduleinwettow AT sungjaekim onthestaticstabilityandseakeepingperformanceofasubmergedfloatingtunnelmoduleinwettow AT moohyunkim onthestaticstabilityandseakeepingperformanceofasubmergedfloatingtunnelmoduleinwettow |