RunUp
Reduction of uncertainties in wave RUN-UP loads on horizontal platforms at monopile offshore foundat
Publieke samenvatting / Public summary
Aanleiding
The design process for Offshore Wind Turbines (OWT) comprises to a substantial part on the consideration of wave loads resulting from extreme sea states on the OWT foundation. Next to the loading on the primary structure of the foundation, the phenomenon of wave run-up can cause significant vertical loading on secondary steel elements above still water level. Especially, essential operational infrastructure such as the working platform or resting platform at offshore monopile foundations are known to experience extreme vertical forces from wave run-up loading. To ensure structural integrity of these platforms over the anticipated lifetime, it is of utmost importance to take vertical wave run-up loads into consideration during the design phase. However, the process of wave run-up and the associated loads on resting and external working platforms is a research area that is associated with considerable uncertainties. The interaction between a wave and a monopile and the resulting wave run-up is a highly complex phenomenon and is still poorly understood. Waves with similar characteristics, can lead to a very different prediction of run-up and loads respectively.
Doelstelling
The JIP RunUp focusses on gaining a better understanding on the relation between non-linear waves and vertical wave run-up loads on horizontal platforms to reduce uncertainties in wave load design. Up to date, there is no clear analytical relation between the characteristics of a wave and resulting run-up and consequently, vertical wave loading on horizontal platforms. Existing design formulations are still associated with considerable uncertainties. Thus, the effect of the monopile diameter or the area of impact are not reflected in current empirical formulations. Within JIP RunUp, we focus to gain a better understanding how these aspects contribute to the wave run-up loading.
Korte omschrijving
The investigation within JIP RunUp is based on an extensive experimental testing scope and numerical simulations. Thereby, the numerical simulations will be supplementary to the physical model tests to make use of the strengths of each approach. The experiments, simulations and analysis performed in this project provide fundamental insights into wave run-up loads on horizontal platforms. Within JIP RunUp we aim to utilise these insights, to improve existing or develop new design formulations for wave run-up loading and allow more conscious design decisions.
Resultaat
With a better understanding of potential wave loading during the lifetime of an offshore structure, the designer can aim for a more cost-effective design and/or reduce maintenance costs during the operational lifetime of the structure.
The design process for Offshore Wind Turbines (OWT) comprises to a substantial part on the consideration of wave loads resulting from extreme sea states on the OWT foundation. Next to the loading on the primary structure of the foundation, the phenomenon of wave run-up can cause significant vertical loading on secondary steel elements above still water level. Especially, essential operational infrastructure such as the working platform or resting platform at offshore monopile foundations are known to experience extreme vertical forces from wave run-up loading. To ensure structural integrity of these platforms over the anticipated lifetime, it is of utmost importance to take vertical wave run-up loads into consideration during the design phase. However, the process of wave run-up and the associated loads on resting and external working platforms is a research area that is associated with considerable uncertainties. The interaction between a wave and a monopile and the resulting wave run-up is a highly complex phenomenon and is still poorly understood. Waves with similar characteristics, can lead to a very different prediction of run-up and loads respectively.
Doelstelling
The JIP RunUp focusses on gaining a better understanding on the relation between non-linear waves and vertical wave run-up loads on horizontal platforms to reduce uncertainties in wave load design. Up to date, there is no clear analytical relation between the characteristics of a wave and resulting run-up and consequently, vertical wave loading on horizontal platforms. Existing design formulations are still associated with considerable uncertainties. Thus, the effect of the monopile diameter or the area of impact are not reflected in current empirical formulations. Within JIP RunUp, we focus to gain a better understanding how these aspects contribute to the wave run-up loading.
Korte omschrijving
The investigation within JIP RunUp is based on an extensive experimental testing scope and numerical simulations. Thereby, the numerical simulations will be supplementary to the physical model tests to make use of the strengths of each approach. The experiments, simulations and analysis performed in this project provide fundamental insights into wave run-up loads on horizontal platforms. Within JIP RunUp we aim to utilise these insights, to improve existing or develop new design formulations for wave run-up loading and allow more conscious design decisions.
Resultaat
With a better understanding of potential wave loading during the lifetime of an offshore structure, the designer can aim for a more cost-effective design and/or reduce maintenance costs during the operational lifetime of the structure.