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Effect of surface roughness on drag of loggerhead carapace

Kah Poh, Alan Chan and Yuan, Cheng See and Mat Yamin, Ahmad Kamal and Jalaluddin, Ainil Jesita and Ishak, Iskandar Shah and Mansor, Shuhaimi (2008) Effect of surface roughness on drag of loggerhead carapace. Jurnal Mekanikal (26). 37 - 48. ISSN 0127-3396


Official URL: http://citeseerx.ist.psu.edu/viewdoc/download?doi=...


The present investigation prim arily 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. Good correlation between the Cd and relative roughness is obtained. 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:Article
Divisions:Mechanical Engineering
ID Code:18865
Deposited By: Kamariah Mohamed Jong
Deposited On:20 Feb 2017 08:20
Last Modified:12 Oct 2017 06:16

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