Numerical study on drag reduction and wake modification for the flows over a hydrofoil in presence of surface heterogeneity

Kouser, Taiba1; Xiong, Yongliang1,2; Yang, Dan3; Peng, Sai4

2022

10.1177/16878140221075306

Advances in Mechanical Engineering   影响因子和分区

1687-8132

1687-8140

In this article, direct numerical simulations of flow around NACA0012 hydrofoil with superhydrophobic surface (SHS) is presented. Surface heterogeneity takes into account by periodic no-slip and shear-free grates on the surface. The study is conducted for a range of 0 degrees - 25 degrees degree angles of attack and at fixed Reynolds number (Re) 1000. SHS leads to effective Navier slip on the hydrofoil surface and corresponding changes in velocity profile. Bubble separation delays for higher gas-fraction (G.F), and minimizes the vortex shedding effects. As a result, flow remains two-dimensional (2D) for higher angles of attack as compared to flow over three-dimensional (3D) hydrofoil with no-slip boundary. Both the drag reduction and enhancement of lift force are observed. Maximum lift are observed at alpha = 13 degrees, while the drag force continues to decrease with the gradual increase in angle of attack and patterned micro-grates fraction. Mode C with smaller wavelength is observed at alpha = 15 degrees. Furthermore, increase in gas-fraction leads to increase in slip length which thickens the boundary layer and mimics the vorticity implies drag reduction. Thus, replacement of the no-slip surfaces by superhydrophobic surfaces can be treated as a promising drag reduction technology.

Superhydrophobic surface no-slip and shear-free boundary angles of attack drag reduction

SCI

英语

其他

National Natural Science Foundation of China (NSFC)[11872187,12072125,51779097]

Thermodynamics ; Engineering

Thermodynamics ; Engineering, Mechanical

WOS:000748433400001

SAGE PUBLICATIONS LTD

Web of Science

1.Huazhong Univ Sci & Technol, Dept Mech, Wuhan 430074, Peoples R China
2.Hubei Key Lab Engn Struct Anal & Safety Assessmen, Wuhan, Peoples R China
3.Huazhong Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Wuhan, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen Key Lab Complex Aerosp Flows, Shenzhen, Peoples R China

Kouser, Taiba,Xiong, Yongliang,Yang, Dan,et al. Numerical study on drag reduction and wake modification for the flows over a hydrofoil in presence of surface heterogeneity[J]. Advances in Mechanical Engineering,2022,14(1).

Kouser, Taiba,Xiong, Yongliang,Yang, Dan,&Peng, Sai.(2022).Numerical study on drag reduction and wake modification for the flows over a hydrofoil in presence of surface heterogeneity.Advances in Mechanical Engineering,14(1).

Kouser, Taiba,et al."Numerical study on drag reduction and wake modification for the flows over a hydrofoil in presence of surface heterogeneity".Advances in Mechanical Engineering 14.1(2022).