Effective method for determining environmental loads on supporting structures for offshore wind turbines

• Autorzy: Dymarski P. , Ciba E. , Marcinkowski T.

Identyfikatory

DOI

10.1515/pomr-2016-0008

• Języki publikacji: EN

Abstrakty

EN

This paper presents a description of an effective method for determining loads due to waves and current acting on the supporting structures of the offshore wind turbines. This method is dedicated to the structures consisting of the cylindrical or conical elements as well as (truncates) pyramids of polygon with a large number of sides (8 or more). The presented computational method is based on the Morison equation, which was originally developed only for cylindrically shaped structures. The new algorithm shown here uses the coefficients of inertia and drag forces that were calculated for non-cylindrical shapes. The analysed structure consists of segments which are truncated pyramids on the basis of a hex decagon. The inertia coefficients, CM, and drag coefficients, CD, were determined using RANSE-CFD calculations. The CFD simulations were performed for a specific range of variation of the period, and for a certain range of amplitudes of the velocity. In addition, the analysis of influence of the surface roughness on the inertia and drag coefficients was performed. In the next step, the computations of sea wave, current and wind load on supporting structure for the fifty-year storm were carried out. The simulations were performed in the time domain and as a result the function of forces distribution along the construction elements was obtained. The most unfavourable distribution of forces will be used, to analyse the strength of the structure, as the design load.

Słowa kluczowe

EN

offshore wind turbine; support structure; Morison force coefficients; CFD; sea wave statistics; Baltic Sea

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2016
• Tom: nr 1
• Strony: 52--60
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Dymarski P.

• Gdańsk Univeristy of Technology Faculty of Ocean Engineering and Ship Technology 11/12 Narutowicza St. 80-233 Gdańsk Poland

autor

Ciba E.

• Gdańsk Univeristy of Technology Faculty of Ocean Engineering and Ship Technology 11/12 Narutowicza St. 80-233 Gdańsk Poland

autor

Marcinkowski T.

• Maritime Institute in Gdansk Długi Targ 41/42 80-830 Gdańsk Poland

Bibliografia

• 1. Sarpkaya T.: Wave forces on offshore structures, Cambridge University Press, 2010
• 2. Sarpkaya T.: In-line and transverse forces on smooth and rough cylinders in oscillatory flow at high Reynolds numbers, Monterey, California. Naval Postgraduate School, 1986
• 3. Recommended Practice DNV-RP-C205: Environmental conditions and environmental loads, Det Norske Veritas, October 2010
• 4. Levis E.V.: Principles of Naval Architecture. Vol. III – Motions in Waves and Controllability, SNAME, 1989
• 5. A NSYS CFX - Solver Theory Guide, ANSYS Inc., October 2012
• 6. Chakrabarti S.K.: Hydrodynamics of Offshore Structures, WIT Press / Computational Mechanics, 2003
• 7. Kamphuis J.W., Introduction to Coastal Engineering and Management, Advanced Series on Ocean Engineering: Volume 30, 2010
• 8. Li F., van Gelder P.H.A.J.M., Ranasighe R., Callghan D.P., Jongejan R.B., Probabilistic modelling of extreme storms along the Dutch coast, Coastal Engineering 86, 2014
• 9. WAMDI Group: The WAM model – A Third Generation Ocean Wave Prediction Model. J. Phys. Oceanography, 18, 1988
• 10. Cieślikiewicz W., Paplińska-Swerpel B.: A 44-year hindcast of wind wave fields over the Baltic Sea, Coastal Engineering 55, 2008
• 11. Dymarski C., Dymarski P., Żywicki J.: Design and strength calculations of the tripod support structure for offshore power plant POLISH MARITIME RESEARCH 1(85) 2015 Vol. 22; pp. 36-46 10.1515/pomr-2015-0006

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.