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The assessment of the effect of surface roughness on drag coefficient and aerodynamics features of loggerhead sea turtle carapace

Chan, Alan Kah Poh and Cheng, See Yuan and Mat Yamin, Ahmad Kamal and Jalaluddin, Ainil Jesita and Ishak, Iskandar Shah and Mansor, Shuhaimi (2008) The assessment of the effect of surface roughness on drag coefficient and aerodynamics features of loggerhead sea turtle carapace. In: 2nd Regional Conference on Vehicle Engineering & Technology, 15 - 16 July 2008, Hotel Istana, Kuala Lumpur.

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Abstract

The present investigation primarily studies the effect of surface roughness on the drag coefficient, Cd of a Loggerhead sea turtle carapace using a subsonic wind tunnel. The pressure coefficient, Cp distribution across the Loggerhead carapace was also investigated and is compared to the Cp trend of an airfoil in order to deduce the aerodynamics features of the Loggerhead carapace. One-to-five-scaled models are created based on the dimensions of a real Loggerhead turtle with simplification. Four roughness scales were employed to capture the Cd trend at increasing Reynolds numbers, Re. As expected, the Cd levelled off with Re for all four models investigated. However, the Re where constant Cd began varies with relative roughness of the carapace models. The results also show good correlation between the Cd and relative roughness. In addition, the wind tunnel results are able to capture the Cp trend of the carapace models and compared to Cp values of an airfoil. Results reveal that the upper surface of the Loggerhead carapace is streamlined but with restrictions of angle of attack.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:drag coefficient, aerodynamics, loggerhead sea turtle, carapace, wind tunnel
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:7003
Deposited By: Dr Abd Rahim Abu Bakar
Deposited On:15 Dec 2008 07:38
Last Modified:24 Jun 2010 02:20

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