Post on 15-Mar-2021
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Prof. Andrei V. Metrikine
Hydrodynamics, Soil Characteristics, Floating
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Content
1. Offshore structures used in oil/gas industry 2. Types of structures potentially applicable for Offshore Wind
3. What is special about Offshore Wind structures 4. Hydrodynamics
• Monopile support
• Jacket support • Floating
5. Soil-structure interaction
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Types of offshore structures used in oil/gas industry
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Types of offshore structures used in oil/gas industry
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Types of offshore structures used in oil/gas industry
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Potentially suitable for Offshore Wind apps structures
1. Bottom founded – monopile; 2. Bottom founded – jacket;
3. Gravity based; 4. Floating/bottom founded – mini TLP (tension leg platform)
5. Floating+moored semisubmercible
6. Floating+moored SPAR
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
What is special about OW structures?
1. Coupled aero-hydro-soil-structure dynamic interaction with active control (sometimes complicated by ice).
2. Relatively high for shallow water (in terms of offshore engineering) overturning moments.
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Hydrodynamics: monopile support
1. Simultaneous action of currents and waves 2. Should not we stop using the Morison’s equation?
3. How much is the hydroelastic interaction influenced by the aeroelastic interaction and control?
4. Breaking waves, sloshing and ringing.
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Hydrodynamics: jacket support
1. We should stop using the Morison’s equation!
2. Simultaneous action of currents and waves, local vorticity
3. How much is the hydroelastic interaction influenced by the aeroelastic interaction and control?
4. Breaking waves, sloshing.
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Hydrodynamics: floating
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Hydrodynamics: floating
1. Simultaneous action of currents and waves in terms of potential occurrence of the VIV (Vortex Induced Vibration).
2. Simultaneous hydro-aero-elastic modelling. 3. Breaking waves and sloshing.
4. Mooring lines (added damping, capacity, fixation to the seabed).
5. Should we design for potential emergency disconnection?
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Soil-structure interaction: challenges focused on monopiles
1. Identification of the dynamic soil properties before and after the installation (stiffness and damping against the monopile motion).
2. Long term stability under the specific and highly dynamic OWT loads.
3. Extreme loads, post holing and self-healing. 4. Pile driving: noise reduction in case of hydraulic driving,
improvement of the vibratory pile driving capacity.
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Identification of the dynamic soil properties (to know the natural frequency and dissipation in soil-
structure interaction)
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Identification of the dynamic soil properties (to know the natural frequency and dissipation in soil-
structure interaction)
1. The identification seems to require the full wave inversion and special type of excitation.
2. Can we in principle identify the dynamic soil properties before the installation?
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Long term stability, extreme loading, post holing, self healing
1. Not much seems to be known as yet for the offshore applications.
2. PISA project may shed some light on the first item.
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Pile driving by hammering: noise reduction
We need to be able to screen the noise
Science & The Energy Challenge in Offshore Wind, 20th of May 2014 Science & The Energy Challenge in Offshore Wind, 20th of May 2014
Pile driving by shakers: smart shaking with the aim to enable a deeper piling
Currently we can drive the piles till a certain depth only… after that the driving method is changed to the hammering.
Challenge: development of smart vibratory patterns.