Topics on extraction of ocean-wave energy

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Information on a lecture-note issue

Topics on Extraction of Ocean-Wave Energy

Various Leftover Lecture Notes

by

Johannes Falnes

(Department of Physics, NTNU, Trondheim, 2002.)

WWW issue on Internet, 2010.

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In the Preface of his textbook Ocean Waves and Oscillation Systems: Linear interactions including wave-energy extraction (Cambridge University Press, 2002) Johannes Falnes states i.a.:

"The present book is mainly based on lecture notes from a postgraduate university course on water waves and extraction of energy from ocean waves, which I have taught many times since 1979. For the purposes of this book, I have selected those parts of the subject which have more general interest, rather than those parts of my course which pertain to wave-power conversion in particular. I hope that the book is thus of interest to a much wider readership than just the wave-energy community."


The leftover parts of his lecture notes were in 2002 collected in an issue entitled " Topics on Extraction of Ocean-Wave Energy" (see cover page illustration to the right). These parts were simply copied from his previous lecture notes, made available in 1993 as a two-volume work entitled "Theory for extraction of ocean-wave energy". On the copied pages, he has (between lines) written (by hand) references to chapters, sections and equations in his above-mentioned textbook. A few errors have been corrected in the 2010 web issue.  

Additional information is given in the preface and summary. The leftover lecture notes are contained in five PDF files, which may be downloaded from links in the list of "Contents" or from (links to pages 1, 31, 38, 68 and 106 in) the table below:

 

 


Table of contents:  

Non-linear free-surface boundary conditions

1

Statistics and energy transport of real ocean waves

6

JONSWAP spectrum

9

Collection of wave data

11

Wave spectrum parameters

16

Wave energy transport

18

Short-term wave statistics

23

Problem S4. Significant wave heights

28

Wave generator without added mass

31

Surging wavemaker

32

Heaving wavemaker

34

Figure D8

37

Slender oscillating water column

38

Phase control

40

Model tests in the laboratory

44

Improved rigid-body description of OWC

57

Power applied by wave generation

60

[Kinetic energy, potential energy and their difference. Relation to reactive power]

62

Parallel rows of oscillating bodies and OWCs

68

Radiation damping matrices

72

Absorbed power

73

Infinitely long array

75

Radiation from the array

76

The array radiation damping matrix

78

Two-dimensional radiation damping matrix

81

Array of heaving axisymmetric arrays

82

Dynamic reflection by heaving slender bodies

84

Maximum absorbed power

88

Maximum power absorption with arrays

89

The case with only one oscillator per group

92

The case with two oscillators per group

97

Two rows of point absorbers

100

Problem K1. Radiation resistance of heaving point absorber

104

Optimum control for maximum power delivery

106

Stråling frå oscillerande elektrisk dipol (Radiation from oscillating electric dipole)

112

Dipolantenne (Dipole antenna)

114

Absorpsjonstverrsnitt for ein Hertz-dipol (Absorption cross section for a Hertz dipole)

116

Vekselverknad mellom lys og eit atom (Interaction between light and an atom)

117

 

          

 

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Contact address:   johannes.falnes(a)ntnu.no
Web page erected:  2010-05-21