The Assessment Of The Effect Of Surface Roughness On Drag Coefficient And Aerodynamics Features Of Loggerhead Sea Turtle Carapace

Cheng, See Yuan and Mat Yamin, Ahmad Kamal and Chan, Alan Kah Poh 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 And Technology 2008, 15-17 July 2008, 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
Divisions:	Faculty of Mechanical Engineering > Department of Thermal Fluids
Depositing User:	Dr. See Yuan Cheng
Date Deposited:	27 Jan 2014 01:06
Last Modified:	05 Jul 2021 16:25
URI:	http://eprints.utem.edu.my/id/eprint/10476
Statistic Details:	View Download Statistic

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