scholarly journals Unsteady forces and flows in low Reynolds number hovering flight: two-dimensional computations vs robotic wing experiments

2004 ◽  
Vol 207 (3) ◽  
pp. 449-460 ◽  
Author(s):  
Z. J. Wang
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Two Dimensional ◽  
Hovering Flight ◽  
Unsteady Forces ◽  
Low Reynolds

Unsteady swimming of small organisms

2012 ◽  
Vol 702 ◽  
pp. 286-297 ◽  
Author(s):  
S. Wang ◽  
A. M. Ardekani
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Fundamental Equation ◽  
Added Mass ◽  
Natural Environments ◽  
Mean Velocity ◽  
Unsteady Forces ◽  
Uniform Background ◽  
Low Reynolds

AbstractSmall planktonic organisms ubiquitously display unsteady or impulsive motion to attack a prey or escape a predator in natural environments. Despite this, the role of unsteady forces such as history and added mass forces on the low-Reynolds-number propulsion of small organisms, e.g. Paramecium, is poorly understood. In this paper, we derive the fundamental equation of motion for an organism swimming by means of the surface distortion in a non-uniform background flow field at a low-Reynolds-number regime. We show that the history and added mass forces are important as the product of Reynolds number and Strouhal number increases above unity. Our results for an unsteady squirmer show that unsteady inertial effects can lead to a non-zero mean velocity for the cases with zero streaming parameters, which have zero mean velocity in the absence of inertia.

Effect of Endplates on Two-Dimensional Airfoil Testing at Low Reynolds Number

2001 ◽  
Vol 38 (6) ◽  
pp. 1056-1059 ◽  
Author(s):  
Alain Pelletier ◽  
Thomas J. Mueller
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Two Dimensional ◽  
Low Reynolds
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