scholarly journals Boundary Velocity Control of Incompressible Flow with an Application to Viscous Drag Reduction

1992 ◽  
Vol 30 (1) ◽  
pp. 167-181 ◽  
Author(s):  
Max D. Gunzburger ◽  
Lisheng Hou ◽  
Thomas P. Svobodny
Keyword(s):  
Drag Reduction ◽  
Incompressible Flow ◽  
Viscous Drag ◽  
Velocity Control ◽  
Boundary Velocity

Some Practical Aspects of Viscous Drag Reduction Concepts

1991 ◽  
Author(s):  
Frank T. Lynch ◽  
Mark D. Klinge
Keyword(s):  
Drag Reduction ◽  
Viscous Drag

Recent developments in fabricating drag reduction surfaces covering biological sharkskin morphology

2016 ◽  
Vol 32 (1) ◽  
Author(s):  
Yuehao Luo ◽  
Xia Xu ◽  
Dong Li ◽  
Wen Song
Keyword(s):  
Global Warming ◽  
Drag Reduction ◽  
Rapid Development ◽  
Three Dimensional ◽  
Viscous Drag ◽  
Environment Protection ◽  
Uv Curable ◽  
Recent Developments ◽  
Potential Benefits ◽  
Energy Shortage

AbstractWith the rapid development of science and technology, increasing research interests have been focused on environment protection, global warming, and energy shortage. At present, reducing friction force as much as possible has developed into an urgent issue. Sharkskin effect has the potential ability to lower viscous drag on the fluid-solid interface in turbulence, and therefore, how to fabricate bio-inspired sharkskin surfaces is progressively becoming the hot topic. In this review, various methods of fabricating drag reduction surfaces covering biological sharkskin morphology are illustrated and discussed systematically, mainly involving direct bio-replicated, synthetic fabricating, bio/micro-rolling, enlarged solvent-swelling, drag reduction additive low-releasing, trans-scale enlarged three-dimensional fabricating, flexible printing, large-proportional shrunken bio-replicating, ultraviolet (UV) curable painting, and stretching deformed methods. The overview has the potential benefits in better acquainting with the recent research status of fabricating sharkskin surfaces covering the biological morphology.

Viscous Drag Reduction Examined in the Light of a New Model of Wall Turbulence

1969 ◽  
pp. 383-407 ◽  
Author(s):  
Thomas J. Black
Keyword(s):  
Drag Reduction ◽  
Wall Turbulence ◽  
Viscous Drag ◽  
New Model

Viscous Drag Reduction in Adverse Pressure Gradient Boundary Layers

2019 ◽  
Author(s):  
Katherine K. Disser ◽  
Thomas C. Corke ◽  
Flint O. Thomas ◽  
Alan Duong ◽  
Samaresh Midya
Keyword(s):  
Pressure Gradient ◽  
Drag Reduction ◽  
Boundary Layers ◽  
Adverse Pressure Gradient ◽  
Viscous Drag

On the Effects of Aero Boundary Layer Control on Pressure Drag Reduction in Supercavitating Bodies

2005 ◽  
Author(s):  
Yasmin Khakpour ◽  
Miad Yazdani
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Pressure Distribution ◽  
Constant Pressure ◽  
Viscous Drag ◽  
Cavity Surface ◽  
Gradient Flows ◽  
Supercavitating Vehicles ◽  
Pressure Drag ◽  
Layer Control

Supercavitation is known as the way of viscous drag reduction for the projectiles, moving in the liquid phase. In recent works, there is distinct investigation between cavitation flow and momentum transfer far away from the cavity surface. However, it seems that there is strong connection between overall flow and what takes place in the sheet cavity where a constant pressure distribution is assumed. Furthermore as we’ll see, pressure distribution on cavity surface caused due to overall conditions, induct nonaxisymetric forces and they may need to be investigated. Primarily we describe how pressure distribution into the cavity can cause separation of the aero boundary layer. Then we present some approaches by which this probable separation can be controlled. Comparisons of several conditions exhibits that at very low cavitation numbers, constant pressure assumption fails particularly for gradient shaped profiles and separation is probable if the flow is sufficiently turbulent. Air injection into the NATURALLY FORMED supercavity is found as an effective way to delay probable separation and so significant pressure drag reduction is achieved. In addition, the position of injection plays a major role to control the aero boundary layer and it has to be considered. Moreover, electromagnetic forces cause to delay or even prevent separation in high pressure gradient flows and interesting results obtained in this regard shows significant drag reduction in supercavitating vehicles.

Turbulent viscous drag reduction with thin-element riblets

AIAA Journal ◽  
1988 ◽  
Vol 26 (4) ◽  
pp. 496-498 ◽  
Author(s):  
B. Lazos ◽  
S. P. Wilkinson
Keyword(s):  
Drag Reduction ◽  
Viscous Drag

Viscous Drag Reduction in a Mach 12 Scramjet Engine

2005 ◽  
Author(s):  
Scott Rowan ◽  
Masahiro Takahashi ◽  
Tetsuji Sunami ◽  
Katsuhiro Itoh ◽  
Tomoyuki Komuro ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Viscous Drag ◽  
Scramjet Engine
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