Stability of motion in a planar layer of inhomogeneous ideal incompressible liquid having free boundaries

1995 ◽  
Vol 36 (2) ◽  
pp. 177-182
Author(s):  
V. E. Zakhvataev
Keyword(s):  
Incompressible Liquid ◽  
Ideal Incompressible Liquid ◽  
Free Boundaries ◽  
Stability Of Motion ◽  
Planar Layer

Note on the Smith-Stone theory of fish propulsion

1964 ◽  
Vol 280 (1382) ◽  
pp. 398-408 ◽  
Keyword(s):  
Incompressible Liquid ◽  
Velocity Potential ◽  
Present Note ◽  
Flexible Plate ◽  
Two Dimensional ◽  
Ideal Incompressible Liquid ◽  
Wake Effect ◽  
Fish Propulsion ◽  
Perturbation Velocity ◽  
Two Dimensional Flow

The present note extends the theory of fish propulsion by E. H. Smith & D. E. Stone, taking into account the wake effect which was not discussed in the original paper. The motion of a fish is simulated by a flexible plate of infinitesimal thickness, infinite span, and constant chord length, moving in the two-dimensional flow field of an ideal incompressible liquid. The perturbation velocity potential for the flexible plate is obtained by solving the Laplace equation in an elliptic cylindrical co-ordinate system, while the wake velocity potential follows from the application of a method which is due to Theodorsen. The results are shown to be identical with those derived previously by Siekmann. A simple example is given for illustration and results predicted by theory are compared with experimental data.

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