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:: Volume 13, Issue 50 (2022) ::
2022, 13(50): 107-116 Back to browse issues page
Simulation of the effect of the holey-sock drogue on the drifter performance
Milad Peimani , Nader Kharestani , Mohammad Reza Khalilabadi
Malek Ashtar University , kharestani_n@mut.ac.ir
Abstract:   (2435 Views)
Background and Objectives: The Lagrangian SVP drifter, developed by Niller, has a good non-slip flow tracking capability in a variety of atmospheric conditions due to its holey-sock drogue. An important factor in the design of drifters is the surface drag coefficient. In the design of drifters, the drag area coefficient of the drogue should be about 40 times of total drag area coefficient of the surface float and tether, and also the amount of torque applied to the tether should be low to minimize the slip of the float surface in waves and strong winds.
Methods: In this research, ANSYS-FLUENT has been used to investigate the holey-sock drogue in three-dimensional turbulent environment. Flow field around the holey-sock drogue clarified the rule of them on hydrodynamic forces. Holes on the drogue cause uniform distribution of the pressure and viscous force around the drogue.
Findings: By modeling the blade drogue, it was found that the presence of the blade on the drogue causes a significant increase in pressure force, which in turn increases the drag coefficient, but these blades cause an undesirable increase in torque on the tether.
Conclusion: It was found that if the blade width is about 10% of the drogue diameter, the drag coefficient is improved by 26%, while the torque on the tether changes by only 3%.
Keywords: lagrangian drifter, drag coefficient, SVP drifter, holey-sock drogue, hydrodynamic force, blade drogue.
Full-Text [PDF 1073 kb]   (664 Downloads)    
Type of Study: Research/ Original/ Regular Article | Subject: Physical Oceanography
Received: 2021/05/25 | Revised: 2023/04/17 | Accepted: 2021/07/1 | ePublished: 2022/07/6

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Peimani M, Kharestani N, Khalilabadi M R. Simulation of the effect of the holey-sock drogue on the drifter performance. Journal of Oceanography 2022; 13 (50) :107-116
URL: http://joc.inio.ac.ir/article-1-1668-en.html

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Volume 13, Issue 50 (2022) Back to browse issues page
نشریه علمی پژوهشی اقیانوس شناسی Journal of Oceanography
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