Wave Run-Up on Offshore Wind Turbines: numerical and experimental results

Jorge Robert Rodriguez Ramirez

Wave Run-Up on Offshore Wind Turbines: numerical and experimental results

Jorge Robert Rodriguez Ramirez

Publikation: Ph.d.-afhandling

Abstract

Interaktionen mellem af vandbølger og en cirkulær konstruktion, det såkaldte "wave run-up" fænomen er undersøgt. Dette run-up fænomen er blevet simuleret ved brug af CFD modeller.

Den numeriske model (NS3) anvendt i dette studie er blevet verificeret på flere måder. Regelmæssige og såkaldte "monsterbølger" (freak- eller rogue waves) er blevet genereret i en numerisk bølgetank med en let hældning for at undersøge "wave run-up" på en cirkulær cylinder. Fra et beregningsmæssigt synspunkt er denne form for undersøgelse "billig". I øvrigt er den numeriske model præsenteret i denne afhandling sammenlignet med de målte resultater fra forsøget og en god sammenhæng er observeret.

Udover denne numeriske undersøgelse, er et omfattende skalaforsøg udført. I forsøget er "wave run-up" på en tynd cirkulær cylinder i en uregelmæssig søtilstand blevet målt med bølgemålere placeret tæt på cylinderen. Baseret på passende analysemetoder er de indsamlede data blevet analyseret med strømfunktionsteorien for at opnå de relevante parametre til brug i den af den forudsagte "wave run-up" formel. En analytisk tilgang er blevet fulgt og løst for individuelle bølger. Maksimal "run-up" og 2% "run-up" er blev undersøgt for at opnå en bedre forståelse af fænomenet. Ifølge resultaterne fra denne analyse er det blevet fastslået, at "run-up" højder i høj grad er påvirket af bølgestejlheden på dybt vand. Samlet set er resultatet af dette studie, at den forenklede model af "wave run-up" på en slank cirkulær cylinder præsenteret i denne afhandling er det mest nyttigt redskab til platformsdesignere.

Originalsprog	Engelsk
Udgivelsessted	Aalborg
Udgiver	Department of Civil Engineering, Aalborg University
Status	Udgivet - 2012

Emneord

Water Waves
Wave Run-Ups
Computational Fluid-Dynamic Models
Model Scale Experiments
Offshore Wind Turbines

AUB Link

Søg efter materialet i Aalborg Universitetsbiblioteks søgemaskine

PhD Project: Wave Forces on Boat Landings.
Ramirez, J. R. R., Frigaard, P. & Andersen, T. L.
<ingen navn>
01/12/2008 → 07/08/2012
Projekter: Projekt › Ph.d.-projekt

Citationsformater

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title = "Wave Run-Up on Offshore Wind Turbines: numerical and experimental results",

abstract = "This study has investigated the interaction of water waves with a circular structure known as wave run-up phenomenon. This run-up phenomenon has been simulated by the use of computational fluid dynamic models.The numerical model (NS3) used in this study has been verified rigorously against a number of cases. Regular and freak waves have been generated in a numerical wave tank with a gentle slope in order to address the study of the wave run-up on a circular cylinder. From the computational side it can be said that it is inexpensive. Furthermore, the comparison of the current numerical model presented in this thesis with the measured results from the experiments has shown a good agreement.Besides this numerical study, model scale experiments have been conducted where the wave run-up on a slender circular cylinder in irregular sea state was measured with surface gauges located close to the cylinder. Based on appropriate analysis the collected data has been analysed with the stream function theory to obtain the relevant parameters for the use of the predicted wave run-up formula. An analytical approach has been pursued and solved for individual waves. Maximum run-up and 2% run-up were studied to get a better understanding of the phenomenon. According to the results from this analysis it has been established that the run-up heights are largely influenced by the deep water wave steepness. Overall, the outcome of this research is that the simplified model presented in this thesis of the wave run-up on a slender circular cylinder is the most useful tool for platform designers.",

keywords = "Water Waves, Wave Run-Ups, Computational Fluid-Dynamic Models, Model Scale Experiments, Offshore Wind Turbines, Water Waves, Wave Run-Ups, Computational Fluid-Dynamic Models, Model Scale Experiments, Offshore Wind Turbines",

author = "Ramirez, {Jorge Robert Rodriguez}",

year = "2012",

language = "English",

series = "DCE Thesis",

publisher = "Department of Civil Engineering, Aalborg University",

number = "39",

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T1 - Wave Run-Up on Offshore Wind Turbines

T2 - numerical and experimental results

AU - Ramirez, Jorge Robert Rodriguez

PY - 2012

Y1 - 2012

N2 - This study has investigated the interaction of water waves with a circular structure known as wave run-up phenomenon. This run-up phenomenon has been simulated by the use of computational fluid dynamic models.The numerical model (NS3) used in this study has been verified rigorously against a number of cases. Regular and freak waves have been generated in a numerical wave tank with a gentle slope in order to address the study of the wave run-up on a circular cylinder. From the computational side it can be said that it is inexpensive. Furthermore, the comparison of the current numerical model presented in this thesis with the measured results from the experiments has shown a good agreement.Besides this numerical study, model scale experiments have been conducted where the wave run-up on a slender circular cylinder in irregular sea state was measured with surface gauges located close to the cylinder. Based on appropriate analysis the collected data has been analysed with the stream function theory to obtain the relevant parameters for the use of the predicted wave run-up formula. An analytical approach has been pursued and solved for individual waves. Maximum run-up and 2% run-up were studied to get a better understanding of the phenomenon. According to the results from this analysis it has been established that the run-up heights are largely influenced by the deep water wave steepness. Overall, the outcome of this research is that the simplified model presented in this thesis of the wave run-up on a slender circular cylinder is the most useful tool for platform designers.

AB - This study has investigated the interaction of water waves with a circular structure known as wave run-up phenomenon. This run-up phenomenon has been simulated by the use of computational fluid dynamic models.The numerical model (NS3) used in this study has been verified rigorously against a number of cases. Regular and freak waves have been generated in a numerical wave tank with a gentle slope in order to address the study of the wave run-up on a circular cylinder. From the computational side it can be said that it is inexpensive. Furthermore, the comparison of the current numerical model presented in this thesis with the measured results from the experiments has shown a good agreement.Besides this numerical study, model scale experiments have been conducted where the wave run-up on a slender circular cylinder in irregular sea state was measured with surface gauges located close to the cylinder. Based on appropriate analysis the collected data has been analysed with the stream function theory to obtain the relevant parameters for the use of the predicted wave run-up formula. An analytical approach has been pursued and solved for individual waves. Maximum run-up and 2% run-up were studied to get a better understanding of the phenomenon. According to the results from this analysis it has been established that the run-up heights are largely influenced by the deep water wave steepness. Overall, the outcome of this research is that the simplified model presented in this thesis of the wave run-up on a slender circular cylinder is the most useful tool for platform designers.

KW - Water Waves

KW - Wave Run-Ups

KW - Computational Fluid-Dynamic Models

KW - Model Scale Experiments

KW - Offshore Wind Turbines

KW - Water Waves

KW - Wave Run-Ups

KW - Computational Fluid-Dynamic Models

KW - Model Scale Experiments

KW - Offshore Wind Turbines

M3 - PhD thesis

T3 - DCE Thesis

PB - Department of Civil Engineering, Aalborg University

CY - Aalborg

ER -

Wave Run-Up on Offshore Wind Turbines: numerical and experimental results

Abstract

Emneord

AUB Link

Fingeraftryk

Projekter

PhD Project: Wave Forces on Boat Landings.

Citationsformater