A master thesis from Aalborg University
CFD analysis of current drag on the Floating Power Plant platform P80
Author(s)
Term
4. term
Education
Publication year
2019
Submitted on
2019-06-07
Pages
106 pages
Abstract
Denne rapport omhandler påvirkningen af dragkræfter på et nyt design af en flydende, kombineret bølgegenerator og vindturbinefundament af Floating Power Plant. Funktionaliteten af platformen P80 afhænger af dens orientering i forhold til bølgeretningen, da den frit kan rotere om fortøjningspunktet. Det er derfor nødvendigt at bestemme strømningens indvirkning på orienteringen af P80. P80’eren er blevet undersøgt via CFD analyser for at undersøge de virkende strømningskræfterne på strukturen. Fuldskala simuleringer er blevet kørt ved Reynolds tal på Re≈50e6. Et nøgleresultat af denne rapport er drag koefficienter, som sammenfalder med retningen af strømningen og ortogonalt på samme, når strømningsretningen angrebsvinkel ændres, med henblik på at bestemme krøjningsmomentet, som strømningen forudsager. Eksperimenter er blevet lavet i renden på AAU på nedskalerede modeller af en floating power plant. Resultater fra disse eksperimenter er blevet anvendt til at validere CFD modellen, som er anvendt til at bestemme dragkræfter forårsaget af strømningen. Andre udfald af projektet inkluderer strømningskræfter på en nedskaleret model af en floating power plant og et af dens ben. Disse kræfter er beregnet ved brug af CFD og er begge understøttet af eksperimentale målinger. Eksperimenterne er udført som en del af dette projekt af forfatterne til denne rapport og er beskrevet i rapporten.
This report concerns drag forces acting on a new design of a semi-submersible, combined wave energy converter and wind turbine generator by Floating Power Plant. The functionality of the platform depends on its orientation towards incoming waves, as the mooring turret enables the platform P80 to rotate freely. It is therefore of interest to determine the current forces effect on the orientation of the P80. The P80 has been the subject of CFD analysis to investigate the current induced forces acting on the structure. Full scale simulations have been performed at Re≈50e6. A main outcome of this report is drag coefficients in line with and transverse to the current direction for different current angles of attack, in order to determine the yawing moment created by the current. Experiments have been performed in the flume at AAU on small scale models of a floating power plant. Results from these experiments have been used to validate the CFD model, which is used for determining current induced drag forces. Other outcomes are current induced forces on a model scale of a FPP and a single Leg of this model. These forces are calculated with CFD and are both supported by experimental measurements. The experiments are performed as part of the project by the authors of this report and presented in detail in this report.
Keywords
CFD ; Numerisk analyse ; Drag ; Current ; eksperiment
Documents
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