A simple model of an OWC-type wave-energy device is used to illustrate a powerful accurate method for computing the hydrodynamic coefficients when sharp edges are present. The device consists simply of a vertical partially immersed circular cylinder open at either end, with power being extracted by constricting the flow of the air trapped in the cylinder above the internal free surface. The method involves the use of the theory of pressure distributions for OWC devices and the hydrodynamical coefficients are computed using an accurate Galerkin method which preserves the reciprocity relations.

1.
Abramowitz, M. A., and Stegun, I. 1964 Handbook of Mathematical Functions, Dover.
2.
Evans
D. V.
,
1976
, “
A Theory for Wave-Power Absorption by Oscillating Bodies
,”
Journal of Fluid Mechanics
, Vol.
77
, pp.
1
25
.
3.
Evans
D. V.
,
1982
, “
Wave-Power Absorption by Systems of Oscillating Surface Pressure Distributions
,”
Journal of Fluid Mechanics
, Vol.
114
, pp.
481
499
.
4.
Evans
D. V.
, and
Porter
R.
,
1995
, “
Hydrodynamic Characteristics of an Oscillating Water Column Device
,”
Applied Ocean Research
, Vol.
17
, pp.
155
164
.
5.
Evans, D. V., O´ Gallacho´ir, B. F., Porter, R., and Thomas, G. P., 1996, “On the Optimal Design of an Oscillating Water Column Device,” Proceedings, 2nd European Wave Power Conference, Lisbon, Portugal.
6.
Falnes
J.
, and
McIver
P.
,
1985
, “
Surface Wave Interactions With Systems of Oscillating Bodies and Pressure Distributions
,”
Applied Ocean Research
, Vol.
7
(
4
), pp.
225
234
.
7.
Falca˜o, J., and Sarmento, A. J. N. A., 1980, “Wave Generation by a Periodic Surface Pressure and Its Application in Wave-Energy Extraction,” 15th International Congress of Theoretical Applied Mechanics, Toronto, Ontario, Canada.
8.
Garrett
C. J. R.
,
1970
, “
Bottomless Harbours
,”
Journal of Fluid Mechanics
, Vol.
43
, pp.
433
449
.
9.
Linton
C. M.
, and
Evans
D. V.
,
1992
, “
The Radiation and Scattering of Surface Waves by a Vertical Circular Cylinder in a Channel
,”
Phil. Transactions Royal Society London A
Vol.
338
, pp.
325
357
.
10.
Mei, C. C., 1983, The Applied Dynamics of Ocean Surface Waves, Wiley Interscience, New York, NY.
11.
Porter
R.
, and
Evans
D. V.
,
1995
, “
Complementary Approximations to Wave Scattering by Vertical Barriers
,”
Journal of Fluid Mechanics
, Vol.
294
, pp.
155
180
.
12.
Simon
M. J.
,
1981
, “
Wave-Energy Extraction by a Submerged Cylindrical Resonant Duct
,”
Journal of Fluid Mechanics
, Vol.
104
, pp.
159
187
.
13.
Smith, C. M., 1983, “Some Problems in Linear Water Wave Theory,” Ph.D. thesis, University of Bristol, Bristol, U.K.
14.
Thomas, G. P., and O´ Gallacho´ir, B. F., 1993, “An Assessment of the Design Parameters for the Bristol Cylinder,” Proceedings, European Wave Power Symposium, Edinburgh, Scotland, pp. 139–144.
15.
Thomas, J. R., 1982, “The Hydrodynamics of Certain Wave Energy Absorbers,” Ph.D. thesis, University of Bristol, Bristol, U.K.
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