Investigation of the stability and hydrodynamics of Tetrosomus gibbosus carapace in different pitch angles


In this paper, stability properties of Tetrosomus gibbosus have been experimentally and numerically studied in pitching movements. This fish lives in southern offshores of Iran. Boxfishes usually live in extremely turbulent parts of seas and oceans, with high stability and maneuverability that has caught the attention of scientists. Their body shape let them swim with a quite rapid speed. Studies on Boxfishes have had influences on automotive and marine industries. The CAD file of the boxfish was created using optical CMM. Also a model was built and tested in a subsonic wind tunnel and a numerical study was conducted in virtual wind tunnel. The experimental results are consistent with the numerical ones and also support the findings of other studies on similar boxfishes. These results show that the flow around the fish, which is a consequence of its body shape, tries to maintain the stable position of the fish by resisting against the external force tilting the fish from its stable horizontal posture. The ventral and dorsal keels of the boxfish generate column-like vortices in horizontal direction which play an imperative role in maintaining the stability of the fish.

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We would like to thank Aref Vandadi, Hassan Nikpey, Mohammadreza DaqiqShirazi and Sina Meftah for their contribution to this research and their kindest helps and supports.

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Correspondence to Alireza Riasi.

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Biography: Mahyar Malekidelarestaqi (1988-), Male, Master, Research Assistant

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Malekidelarestaqi, M., Riasi, A., Moradi, H. et al. Investigation of the stability and hydrodynamics of Tetrosomus gibbosus carapace in different pitch angles. J Hydrodyn 31, 368–378 (2019).

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Key words

  • Boxfish
  • Tetrosomus gibbosus
  • humpback turretfish
  • hydrodynamic stability
  • experimental fluid mechanics
  • bio-inspired engineering