Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition
The transient response of the VLFS subjected to arbitrary external load is systematically investigated by a direct time domain modal expansion method, in which the BEM solutions based on time domain Kelvin sources are used for hydrodynamic forces. In the analysis, the time domain free-surface Green...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Abstract and Applied Analysis |
| Online Access: | http://dx.doi.org/10.1155/2014/628564 |
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| _version_ | 1832550294408396800 |
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| author | Yong Cheng Gang-jun Zhai Jin-ping Ou |
| author_facet | Yong Cheng Gang-jun Zhai Jin-ping Ou |
| author_sort | Yong Cheng |
| collection | DOAJ |
| description | The transient response of the VLFS subjected to arbitrary external load is systematically investigated by a direct time domain modal expansion method, in which the BEM solutions based on time domain Kelvin sources are used for hydrodynamic forces. In the analysis, the time domain free-surface Green functions with sufficient accuracy are rapidly evaluated in finite water depth by the interpolation-tabulation method, and the boundary integral equation with a quarter VLFS model is established taking advantage of symmetry of flow field and structure. The validity of the present method is verified by comparing with the time histories of vertical displacements of the VLFS during a mass drop and airplane landing and takeoff in still water conditions, respectively. Then the developed numerical scheme is used in wave conditions to study the combined action taking into account the mass drop/airplane landing/takeoff loads as well as incident wave action. It is found that the elevation of structural waves due to mass drop load can be significantly changed near the impact region, while the vertical motion of runway in wave conditions is dominant as compared with that only generated by airplane. |
| format | Article |
| id | doaj-art-958badf44c154f60a73dbd66526e1bca |
| institution | Kabale University |
| issn | 1085-3375 1687-0409 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Abstract and Applied Analysis |
| spelling | doaj-art-958badf44c154f60a73dbd66526e1bca2025-02-03T06:07:14ZengWileyAbstract and Applied Analysis1085-33751687-04092014-01-01201410.1155/2014/628564628564Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave ConditionYong Cheng0Gang-jun Zhai1Jin-ping Ou2Deepwater Engineering Research Center, Dalian University of Technology, Dalian 116024, ChinaDeepwater Engineering Research Center, Dalian University of Technology, Dalian 116024, ChinaDeepwater Engineering Research Center, Dalian University of Technology, Dalian 116024, ChinaThe transient response of the VLFS subjected to arbitrary external load is systematically investigated by a direct time domain modal expansion method, in which the BEM solutions based on time domain Kelvin sources are used for hydrodynamic forces. In the analysis, the time domain free-surface Green functions with sufficient accuracy are rapidly evaluated in finite water depth by the interpolation-tabulation method, and the boundary integral equation with a quarter VLFS model is established taking advantage of symmetry of flow field and structure. The validity of the present method is verified by comparing with the time histories of vertical displacements of the VLFS during a mass drop and airplane landing and takeoff in still water conditions, respectively. Then the developed numerical scheme is used in wave conditions to study the combined action taking into account the mass drop/airplane landing/takeoff loads as well as incident wave action. It is found that the elevation of structural waves due to mass drop load can be significantly changed near the impact region, while the vertical motion of runway in wave conditions is dominant as compared with that only generated by airplane.http://dx.doi.org/10.1155/2014/628564 |
| spellingShingle | Yong Cheng Gang-jun Zhai Jin-ping Ou Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition Abstract and Applied Analysis |
| title | Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition |
| title_full | Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition |
| title_fullStr | Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition |
| title_full_unstemmed | Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition |
| title_short | Direct Time Domain Numerical Analysis of Transient Behavior of a VLFS during Unsteady External Loads in Wave Condition |
| title_sort | direct time domain numerical analysis of transient behavior of a vlfs during unsteady external loads in wave condition |
| url | http://dx.doi.org/10.1155/2014/628564 |
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