Simple Oscillating Water Column (OWC) Device Operating Principle & Flow Dynamics Simulation

The following animation demonstrates a simplified simulation of the kinematics involved in a Morisson wave when encountering an off-shore OWC (Oscillating Water Column) device acting as a "terminator". The incident wave successively builds up crests and troughs in front of the OWC entrance wall, forcing the Oscillating Water Column contained in the interim chamber to follow in close sequence and amplitude. The entrapped air is consequently compressed to a value slightly above atmospheric pressure during crest formation and decompressed to a value slightly bellow atmospheric during the trough formation. By appropriately arranging two sets of non-return (check valves) valves, the air flow produced may be diverted as to follow the same directional path, driving a unidirectional air turbine, which in turn provides mechanical energy for electricity production, etc.

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The Oscillating Water Column Wave-energy Device

An expression is obtained for the efficiency of wave-energy absorption of a float connected to a spring-dashpot system on the top of a column of fluid bounded by two closely-spaced vertical parallel plates or a narrow tube immersed under waves. The method makes extensive use of the approximate solution using matched asymptotic expansions obtained by Newman (1974) to the corresponding problem when the float-spring-dashpot system was absent. It is shown that for plates of equal length the maximum possible efficiency is 50%, and that for the three-dimensional case it is theoretically possible to capture the energy in a wave whose crest length is greater than the tube diameter.

kelas dah bermula

kelas dah mula dan mula ler episod baru pada diri ku ini.makin tinggi belajar makin tinggi ler kebodohan diri ku ini.aku dah tak tau ni kate ape2 lagi cume y aku harapkandoa dr family n rakan2 seperjuangan untuk ku terus berjaya dalam hidup ini.ini semester akhir aku dah janji pada diri aku ini supaya skor 4.oo.doa dr rakan2 akan mengiringi aku tuk menempuhi masa 5bulan ini.doakan aku berjaya dalam semster ini.
janji-janji aku:
1)lebih taat pada ALLAH
2)akan lebih tumpu perhatian pada bile-bile masa asal ada kaitan dgn pelajaran
3)tak nk main-main lagi lebih fokus.
4)tubuh badan sentiasa sihat(bersenam)
5)terakhir aku akan pastikan aku akan patuhi ape y aku dah janji kat atas

ini antara 5 y aku dah janji pada diri aku.aku harap dapt habis kan diploma ini dgn lebih sempurna dan memberi seribu makna bagi diri aku.

kesungguhan ada di mane-mane sahaja.tp klu kita asyik tunggu kesungguhan tu datang dia tak akn sdatang dgn sendiri.ia perlu dicari..
akhir kata doa tanpa usaha i barat pokok yang dibaja tanpa disiram air...
dan doa tanpa usaha bagai pokok di belai tanpa baja
oleh itu doa dan usah sentiasa seiring dan sejalan.......
selamat tinggal semua.......

Perjuangan yang belum selasai

11/01/2010 mula ler satu kisah baru pada diri ku ini.klu dulu study biasa-biasa sajer tp sekarang dah tak boleh sbb ini ada lah waktu yang paling penting dalam hidup in walaupun masih terlalu awal tuk kt judge.sbb semester ni ler kt perlu tunjukkn kepintaran kt tuk maju ke hadapan.dan pointer aku lak memang cukup-cukup makan tuk meneruskan perjuangan dan impisan aku pada masa akan datan.oleh itu aku perlu sokongan dr semua pihak family n kawan-kawan.doakan aku dpat kejar impian aku ni.

I'm back

sudah sekian lamu aku tak update blog.tp dalam kelamaan itu berbagai onak dan duri dah dilalui.skrg aku masih berfikir adakah aku patut teruskan hidup sebegini rupa atau mulakan hidup yang baru dab lupakan semua perkara-perkara yang membuat aku hilang arah tuju hidup ini.