Identification of Drag Force of the Underwater Vehicles
An inverse analysis is conducted for the estimation of drag coefficient and wake’s width in incompressible turbulent flows over the moving underwater bodies. The inverse analysis uses the laws of momentum and mass conservation for a control volume to estimate the drag coefficient and the wake’s widt...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Isfahan University of Technology
2017-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=41785&issue_ID=238 |
| _version_ | 1818154121833742336 |
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| author | Yaser Jahangardy Reza Madoliat N. M. Nouri |
| author_facet | Yaser Jahangardy Reza Madoliat N. M. Nouri |
| author_sort | Yaser Jahangardy |
| collection | DOAJ |
| description | An inverse analysis is conducted for the estimation of drag coefficient and wake’s width in incompressible turbulent flows over the moving underwater bodies. The inverse analysis uses the laws of momentum and mass conservation for a control volume to estimate the drag coefficient and the wake’s width from the measured velocity in the wake. The drag coefficient and wake’s width are determined as unknown parameters by the Levenberg–Marquardt algorithm. The proposed inverse method is applicable for an environment without boundaries (e.g., the sea). Several experiments are conducted to evaluate the developed inverse algorithm. The wake velocity behind a cylinder located in the flow field is measured by a calibrated pitot tube and is used as an input to the algorithm. The cylinder is selected as the test body, because its hydrodynamic information is available in the literature. The effects of the tunnel’s wall and the turbulence intensity are considered in the results of the algorithm. The estimated drag coefficient is validated by the values presented in the literature. The estimated wake-velocity profiles are fitted favorably with the measured velocities at the corresponding locations. It is shown that the proposed inverse method can be used to estimate the drag coefficient and wake’s width of the underwater vehicles with very good accuracy. |
| first_indexed | 2024-12-11T14:21:29Z |
| format | Article |
| id | doaj.art-9d0bfc91873f4d6c9089ebecdd18b2cf |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-11T14:21:29Z |
| publishDate | 2017-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-9d0bfc91873f4d6c9089ebecdd18b2cf2022-12-22T01:02:53ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722017-01-01101275281.Identification of Drag Force of the Underwater VehiclesYaser Jahangardy0Reza Madoliat1N. M. Nouri2IUSTIUSTmnouri@iust.ac.irAn inverse analysis is conducted for the estimation of drag coefficient and wake’s width in incompressible turbulent flows over the moving underwater bodies. The inverse analysis uses the laws of momentum and mass conservation for a control volume to estimate the drag coefficient and the wake’s width from the measured velocity in the wake. The drag coefficient and wake’s width are determined as unknown parameters by the Levenberg–Marquardt algorithm. The proposed inverse method is applicable for an environment without boundaries (e.g., the sea). Several experiments are conducted to evaluate the developed inverse algorithm. The wake velocity behind a cylinder located in the flow field is measured by a calibrated pitot tube and is used as an input to the algorithm. The cylinder is selected as the test body, because its hydrodynamic information is available in the literature. The effects of the tunnel’s wall and the turbulence intensity are considered in the results of the algorithm. The estimated drag coefficient is validated by the values presented in the literature. The estimated wake-velocity profiles are fitted favorably with the measured velocities at the corresponding locations. It is shown that the proposed inverse method can be used to estimate the drag coefficient and wake’s width of the underwater vehicles with very good accuracy.http://jafmonline.net/JournalArchive/download?file_ID=41785&issue_ID=238Inverse method; Drag force identification; Wake velocity profile. |
| spellingShingle | Yaser Jahangardy Reza Madoliat N. M. Nouri Identification of Drag Force of the Underwater Vehicles Journal of Applied Fluid Mechanics Inverse method; Drag force identification; Wake velocity profile. |
| title | Identification of Drag Force of the Underwater Vehicles |
| title_full | Identification of Drag Force of the Underwater Vehicles |
| title_fullStr | Identification of Drag Force of the Underwater Vehicles |
| title_full_unstemmed | Identification of Drag Force of the Underwater Vehicles |
| title_short | Identification of Drag Force of the Underwater Vehicles |
| title_sort | identification of drag force of the underwater vehicles |
| topic | Inverse method; Drag force identification; Wake velocity profile. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=41785&issue_ID=238 |
| work_keys_str_mv | AT yaserjahangardy identificationofdragforceoftheunderwatervehicles AT rezamadoliat identificationofdragforceoftheunderwatervehicles AT nmnouri identificationofdragforceoftheunderwatervehicles |