Effect of wall slip on laminar flow past a circular cylinder

Li, Yan-cheng1,2,3; Peng, Sai4; Kouser, Taiba5

2022-08-01

10.1007/s00707-022-03297-1

ACTA MECHANICA   影响因子和分区

0001-5970

1619-6937

A numerical study of two-dimensional flow past a confined circular cylinder with slip wall is performed. A dimensionless number, Knudsen number (Kn), is used to describe the slip length of the cylinder wall. The Reynolds number (Re) and Knudsen number (Kn) ranges considered are Re = [1, 180] and Kn = [0, infinity), respectively. Time-averaged flow separation angle ((theta(s)) over bar), dimensionless recirculation length ((L-s) over bar), and tangential velocity ((u(tau)) over bar) distributed on the cylinder's wall, drag coefficient ((C-d) over bar) and drag reduction (DR) are investigated. The time-averaged tangential velocity distributed on the cylinder's wall fits well with the formula (u(tau)) over bar = U-infinity. [alpha/1+beta e(-gamma(pi-theta)) + delta]. sin theta, where the coefficients (alpha, beta, gamma, delta) are related to Re and Kn, and U infinity the incoming velocity. Several scaling laws are found, log((u(tau) (max)) over bar) similar to log(Re) and (u(tau max)) over bar similar to Kn for low Kn ((u(tau max)) over bar is the maximum tangential velocity on the cylinder's wall), log(DR)similar to log(Re) (Re <= 45 and Kn <= 0.1) and log(DR) similar to log(Kn) (Kn <= 0.05). At low Re, DRv (the friction drag reduction) is the main source of DR. However, DRp (the differential pressure drag reduction) contributes most to DR at high Re (Re > similar to 60) and Kn over a critical number. DRv is found almost independent of Re.

SCI ; EI

英语

通讯

National Natural Science Foundation of China (NSFC)[12002148] ; Guangdong Basic and Applied Basic Research Foundation[2022A1515011057]

Mechanics

Mechanics

WOS:000847248800003

SPRINGER WIEN

20223612692256

Circular cylinders ; Flow separation ; Laminar flow ; Reynolds number ; Velocity

Fluid Flow:631 ; Fluid Flow, General:631.1

ENGINEERING

Web of Science

1.Wuhan Univ Technol, Minist Educ, Key Lab High Performance Ship Technol, Wuhan 430063, Peoples R China
2.Wuhan Univ Technol, Sch Naval Architecture Ocean & Energy Power Engn, Wuhan 430063, Peoples R China
3.Wuxi Inst Commun Technol, Sch Naval Engn, Wuxi 214151, Jiangsu, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen Key Lab Complex Aerosp Flows, Shenzhen 518055, Peoples R China
5.Govt Coll Univ Faisalabad, Dept Math, Faisalabad 38000, Pakistan

Li, Yan-cheng,Peng, Sai,Kouser, Taiba. Effect of wall slip on laminar flow past a circular cylinder[J]. ACTA MECHANICA,2022.

Li, Yan-cheng,Peng, Sai,&Kouser, Taiba.(2022).Effect of wall slip on laminar flow past a circular cylinder.ACTA MECHANICA.

Li, Yan-cheng,et al."Effect of wall slip on laminar flow past a circular cylinder".ACTA MECHANICA (2022).