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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2017, Vol. 18 Issue (1): 59-66    DOI: 10.1631/jzus.A1500324
Articles     
Skin friction reduction characteristics of variable ovoid non-smooth surfaces
Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
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Abstract  The use of bionic non-smooth surfaces is a popular approach for saving energy because of their drag reduction property. Conventional non-smooth structures include riblets and dimples. Inspired by sand dunes, a novel variable ovoid non-smooth structure is proposed in this study. The body of the variable ovoid dimple was designed based on three size parameters, the radius, semimajor, and depth, and a 3D model was created based on UG software. The constructed variable dimples were placed in a rectangular array on the bottom of a square tube model. Following ANSYS meshing, the grid model was imported into FLUENT, where the flow characteristics were calculated. Results of skin friction reduction were achieved and the effect of the design parameters on different variable ovoid dimples was obtained by orthogonal testing. Various aspects of the skin friction reduction mechanism were discussed including the distribution of velocity vectors, variation in boundary layer thickness, and pressure distribution.

Key words： Variable ovoid dimple      Non-smooth surface      Numerical simulation      Skin friction reduction     
Received: 06 December 2015      Published: 03 January 2017
CLC:  TH161.12  
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Xiao-wen Song
Peng-zhe Lin
Rui Liu
Pei Zhou
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Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou. Skin friction reduction characteristics of variable ovoid non-smooth surfaces. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2017, 18(1): 59-66.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1500324     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2017/V18/I1/59

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