scholarly journals Numerical Simulations of Natural and Actuated Flow over a 3-D, Low-Aspect-Ratio Airfoil

2010 ◽  
Author(s):  
Guillaume Brès ◽  
David Williams ◽  
Tim Colonius
Keyword(s):  
Aspect Ratio ◽  
Numerical Simulations ◽  
Low Aspect Ratio

Experimental Study of Very Low Aspect Ratio Wings in Slender Bodies

2012 ◽  
Author(s):  
M. A. Arevalo-Campillos ◽  
S. Tuling ◽  
L. Parras ◽  
C. del Pino ◽  
L. Dala
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Numerical Simulations ◽  
Water Channel ◽  
Vortex Sheet ◽  
The Body ◽  
Low Aspect Ratio ◽  
Moderate Reynolds Number ◽  
Slender Bodies ◽  
Low Aspect Ratio Wings

The dynamics of very low aspect ratio wings (or strakes) vortices in slender bodies are complex due to the interaction of the shed vortex sheet and the body vortex. For missiles at supersonic speeds these interactions are not easily predicted using engineering level tools. To shed some new light onto this problem, an experimental study in a water channel for moderate Reynolds number (Re = 1000) was performed for a 19D body and strake configuration with strakes having a span to body diameter ratio of 1.25. Comparisons to numerical simulations in supersonic flow are also performed. Flow visualisation has been carried out to characterize the vortex dynamics at different angles of attack; these being 11°, 16°, 22° and 27°. The comparison between a slender body without strakes and the body-strake configuration has given some key indicators in relation to the vortex position of the core. Furthermore, unsteady wing-body interference has been observed at angles of attack above 20° for both experimental and numerical simulations. Consequently, the average position of the vortex core is located at larger distances from the missile in comparison to the body without strakes. The numerical simulations show good correlation with the experimental tests even though the dynamic convective interactions between the body vortex and strake vortex sheet are not predicted.

scholarly journals The effect of aspect ratio on adhesion and stiffness for soft elastic fibres

2011 ◽  
Vol 8 (61) ◽  
pp. 1166-1175 ◽  
Author(s):  
Burak Aksak ◽  
Chung-Yuen Hui ◽  
Metin Sitti
Keyword(s):  
Numerical Analysis ◽  
Aspect Ratio ◽  
Numerical Simulations ◽  
Adhesive Strength ◽  
Polyurethane Elastomer ◽  
Rigid Surface ◽  
Elastic Fibres ◽  
Low Aspect Ratio ◽  
Adhesive Interface

The effect of aspect ratio on the pull-off stress and stiffness of soft elastic fibres is studied using elasticity and numerical analysis. The adhesive interface between a soft fibre and a smooth rigid surface is modelled using the Dugdale–Barenblatt model. Numerical simulations show that, while pull-off stress increases with decreasing aspect ratio, fibres get stiffer. Also, for sufficiently low aspect ratio fibres, failure occurs via the growth of internal cracks and pull-off stress approaches the intrinsic adhesive strength. Experiments carried out with various aspect ratio polyurethane elastomer fibres are consistent with the numerical simulations.

MRI investigation and complementary numerical simulations of flow-through random bead packings with low aspect ratio

2005 ◽  
Vol 23 (2) ◽  
pp. 369-370 ◽  
Author(s):  
Claudia Heinen ◽  
Joachim Tillich ◽  
Hans Buggisch ◽  
Thomas Zeiser ◽  
Hannsjörg Freund
Keyword(s):  
Aspect Ratio ◽  
Numerical Simulations ◽  
Low Aspect Ratio ◽  
Flow Through

Development of an Ion Beam Probe System for Potential Measurement in the Low Aspect-Ratio Torus Experiment Device

2012 ◽  
Vol 132 (7) ◽  
pp. 567-573
Author(s):  
Hitoshi Tanaka ◽  
Shota Omi ◽  
Jun Katsuma ◽  
Yurie Yamamoto ◽  
Masaki Uchida ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Ion Beam ◽  
Potential Measurement ◽  
Low Aspect Ratio ◽  
Probe System ◽  
Experiment Device
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