Vortex Induced Vibration

As a fluid particle flows toward the leading edge of a cylinder, the pressure in the fluid particle rises from the free stream pressure to stagnation pressure. The high fluid pressure near the leading edge impels flow about the cylinder as boundary layer develop about both sides. However, the high pressure is not sufficient to force the flow about the back of the cylinder at high Reynolds numbers. Near the widest section of the cylinder, the boundary layers separate from each side of the cylinder surface and form two shear layers that trail aft in the flow and bound the wake. Since the innermost portion of the shear layers, which is in contact with the cylinder, moves much more slowly than the outermost portion of the shear layers, which is in contact with the free flow, the shear layers roll into near wake, where they fold on each other and coalesce into discrete swirling vortices (Perry et al,. 1982; Williamson and Roshko, 1988). A regular pattern of vortices, called a vortex street, trails aft in the wake. The vortices interact with the cylinder and they are the source of the effects called vortex-induced vibration.

Sediment Transport

About 1/3 of the world’s population live near the coast, mostly with shallow water. These are affected by sediment transport and erosion.

Some important examples:

• Erosion of beaches and sandstone rocks/cliffs
• Difficulties for ships to approach harbours – dredging
• Flooding – destruction of urban and agricultural areas filled with sediments
• Transport of Pollution

Concept: Waves and current induced drag forces on the sea bottom. This leads to that bottom sediments (such as sand) is being transported.

Statkraft takes lead in tidal power

Norway’s Statkraft has invested approximately NOK 45 million in Atlantis Resources, one of the world’s leading developers of tidal power. Statkraft says the agreement with Atlantis secures the company access to cutting-edge expertise and a presence on the board, as well as exclusive negotiating rights regarding participation in material projects initiated by Atlantis to develop tidal energy in the United Kingdom and Canada.

Statkraft and Atlantis will also collaborate on licence applications for Scotland’s Pentland Firth, with licences to develop up to 700 MW of marine energy due to be allocated during 2009.

Examples on Marine Operations (VERITAS Marine Operation)

• Loud out

The activities necessary to transfer a structure from land onto a vessel for transportation.

• Float Out

The activities necessary to transfer a structure from a dry construction site (dry dock) to a self-floating condition outside the construction site for towing or mooring.

• Float on/ Float Off

The activities necessary to transfer a floating structure onto the deck of a barge or self-propelled vessel and vice versa.

• Towing

The transfer at sea from one location to another of a self-floating structure or a structure resting on a barge by pushing/pulling by tugs.

Beasiswa ITB Untuk Semua

Program “ITB Untuk Semua” adalah suatu skema penerimaan mahasiswa baru Institut Teknologi Bandung yang secara khusus menyediakan bangku kuliah bagi para lulusan sekolah menengah umum dari keluarga yang tidak mampu secara ekonomi dengan penghasilan kedua orang tua di bawah atau sama dengan Upah Minimum Regional setempat. Uang pendidikan, ongkos tempat tinggal, dan biaya hidup selama menempuh kuliah di Bandung akan didanai beasiswa “ITB Untuk Semua” . Untuk beasiswa ini, alokasi dana yang disediakan ialah 100 juta per anak untuk lima tahun. Dana akan diperoleh dari alumni ITB, baik perseorangan atau berkelompok. Alumni yang sudah bersedia menjadi orang tua asuh diantaranya Ir. Benny Subianto, Ir. Martiono Hadianto, Ir. Betty Alisjahbana, Ir. Karen Agustiawan. Sekitar 100 bangku kuliah disediakan secara khusus bagi para lulusan SMU angkatan 2009.

NTNU

About AUV

Tidal Wave Alternative Energy

Quota Scheme Scholarship at NTNU

Buat rekan-rekan yang masih ingin melanjutkan kuliah lagi, berikut link yang berisi informasi beasiswa yang diberikan oleh Norwegian University of Science & Technology (NTNU) under Quota Scheme Program.

Quota Scheme Program at NTNU – Norway

Pengalaman di negeri viking

Diceritakanlah seorang pengembara berkelana hingga tiba di negeri viking nun jauh dari kampung halamannya di bumi khatulistiwa.

Negeri viking? yah begitulah adanya, negeri ini identik dengan cerita jaman dahulu kala mengenai viking yang sarat dengan kekerasan dan perompakan jauh dari cerita-cerita mengenai kampung halamannya yang terkenal sebagai negeri antah berantah yang kaya raya dengan sumber daya alamnya dan terkenal sekali dengan orangnya yang sangat ramah, namun itu sudah usang tertelan waktu.

Wisdom-2

“Control your destiny or someone else will“

Wisdom-1

“You got Knowledge and Skills but you must have Attitude and Wisdom”

Wave Energy

StatoilHydro has invested in wave power technology developed by Ocean Power Delivery (OPD). ODP will build the world’s first commercial wave power plant off the coast of Portugal.

WAVE ENERGY: The Pelamis units move with the waves up and down and from side to side, and are connected via subsea cables to the land-based electricity grid.

SWAY – Changing the future of Wind Power

SWAY has developed a solution that will overcome the most significant arguments against wind power – lack of economy and disturbance of the landscape. The solution has the potential of securing a number of nations worldwide economical access to an unlimited energy source with no pollution and minimal environmental controversy.

SWAY is a renewable energy company, with world leading technology and competence on floating wind turbines located in deep water.

Ocean Energy

Renewable Energy:

• Ocean Energy
• Wave Power
• Tidal Energy