Low Reynolds Number Turbulent Flow in Laboratory Flume

1986 ◽  
Vol 112 (1) ◽  
pp. 55-69 ◽  
Author(s):  
Habib O. Anwar
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Low Reynolds Number ◽  
Laboratory Flume ◽  
Low Reynolds

Application of Non-Linear k–ω Model to the Turbulent Flow Inside a Sharp U-Bend

2000 ◽  
Author(s):  
B. Song ◽  
R. S. Amano
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Low Reynolds Number ◽  
Turbulence Models ◽  
Higher Order ◽  
Shear Stresses ◽  
Complex Flow ◽  
Streamline Curvature ◽  
Non Linear ◽  
Low Reynolds

Simulation of the complex flow inside a sharp U-bend needs both refined turbulence models and higher order numerical discretization schemes. In the present study, a nonlinear low-Reynolds number (low-Re) k–ω model including the cubic terms was employed to predict the turbulent flow through a square cross-sectioned U-bend with a sharp curvature, Rc/D = 0.65. In the turbulence model employed for the present study, the cubic terms are incorporated to represent the effect of extra strain-rates such as streamline curvature and three-dimensionality on both turbulence normal and shear stresses. In order to accurately predict such complex flowfields, a higher-order bounded interpolation scheme (Song, et al., 1999) has been used to discretize all the transport equations. The calculated results by using both the non-linear k–ω model and the linear low-Reynolds number k–ε model (Launder and Sharma, 1974) have been compared with experimental data. It is shown that the present model produces satisfactory predictions of the flow development inside the sharp U-bend and well captures the characteristics of the turbulence anisotropy within the duct core region and wall sub-layer.

2E1 Active Control of Reattaching Flow Field at Low Reynolds Number Turbulent Flow Region

2013 ◽  
Vol 2013 (0) ◽  
pp. 143-144
Author(s):  
Naoto YAMAGUCHI ◽  
Isao TERUYA ◽  
Masaaki ISHIKAWA ◽  
Yuta MURO
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
Turbulent Flow ◽  
Active Control ◽  
Low Reynolds Number ◽  
Flow Region ◽  
Low Reynolds

Prediction of Laminar to Turbulent Flow over a Sweptback Wing

2011 ◽  
Vol 110-116 ◽  
pp. 3473-3480
Author(s):  
Sakthivel Arumugam ◽  
Shanmugasundaram Durairaj
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Low Reynolds Number ◽  
Flow Conditions ◽  
Stability Equation ◽  
Parabolized Stability Equations ◽  
Low Reynolds

The Prediction of Laminar-Turbulent flow over wings and airfoils is necessary for low-Reynolds number airflows. The Prediction of onset of transition based on linear and Parabolized Stability Equations (PSE) using en method is reviewed and factors that influence the choice of approach are discussed. Comparison between prediction of linear and parabolized stability equation are given for a range of flow conditions on an Infinite sweptback wing.

scholarly journals Effects of Turbulators on Airfoil at Low Reynolds Number in Turbulent Flow

2007 ◽  
Author(s):  
Juan Delnero ◽  
Julio Marañón Di Leo ◽  
Mariano Martinez ◽  
Federico Bacchi ◽  
Jorge Colman Lerner ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Low Reynolds Number ◽  
Low Reynolds

A New Low-Reynolds-Number k-ε Model for Turbulent Flow Over Smooth and Rough Surfaces

1996 ◽  
Vol 118 (2) ◽  
pp. 255-259 ◽  
Author(s):  
Hanzhong Zhang ◽  
Mohammad Faghri ◽  
Frank M. White
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Dissipation Rate ◽  
Rough Surfaces ◽  
Low Reynolds Number ◽  
Friction Factors ◽  
Log Law ◽  
Low Reynolds ◽  
Flow Experiments ◽  
Grain Roughness

A new low-Reynolds-number k-ε model is proposed to simulate turbulent flow over smooth and rough surfaces by including the equivalent sand-grain roughness height into the model functions. The simulation of various flow experiments shows that the model can predict the log-law velocity profile and other properties such as friction factors, turbulent kinetic energy and dissipation rate for both smooth and rough surfaces.

An Expression of Reynolds Stresses in Turbulent Lubrication Theory

1992 ◽  
Vol 114 (1) ◽  
pp. 57-60 ◽  
Author(s):  
A. K. Tieu ◽  
P. B. Kosasih
Keyword(s):  
Reynolds Number ◽  
Shear Stress ◽  
Turbulent Flow ◽  
Low Reynolds Number ◽  
Stress Gradient ◽  
Lubrication Theory ◽  
Mixing Length ◽  
Reynolds Stresses ◽  
Shear Stress Gradient ◽  
Low Reynolds

This paper proposes an alternative model of Reynolds stresses for turbulent lubrication theory. The approach relies on Prandtl’s mixing length theory which is based on a modified Van Driest mixing formula [1]. However, unlike the previous theories [2, 3] the proposed equation is capable of accounting for the effect of shear stress gradient on the mixing length. Thus it is well suited to turbulent flow analysis in bearings where the presence of shear stress gradient due to the effect of pressure gradient should be considered. A series of velocity measurements in thin channels in the low Reynolds number turbulent flow range are analysed using the theory. The data analysis shows a strong effect of shear stress gradient on the viscous sublayer in the low Reynolds number regime. As a result, a new model of mixing length applicable to the turbulent lubrication analysis in thin film at low or high Reynolds numbers or under low or high shear stress gradient is presented.

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