LiftWEC Deliverable D3.2: Preliminary assessment of computational capability report release_m57a6lzfgncrjjs4kf3zaklndm

by Gerrit Olbert, Martin Scharf

Published by Zenodo.

2020  

Abstract

This deliverable shows a preliminary assessment of the performance of the employed numerical tools for the purpose of hydrodynamic modelling within the LiftWEC project. Two modelling approaches and their respective implementation are presented and their theoretical background is discussed. This background is required in order to assess the impact of certain modelling assumptions on the results of the numerical simulations. Subsequently, the numerical tools are applied to three different scenarios of hydrofoils interacting with one or multiple fluids. As the hydrodynamic performance of a lift-based wave energy converter (WEC) largely depends on its ability to capture wave energy and transform it into a lift force accelerating it in tangential direction of its rotary path while maintaining a low drag, the investigation of the foil near-flow field as well as its direction interaction with the free surface was deemed an appropriate starting point for a preliminary assessment. Due to the limited number of research groups which have hitherto worked on the concept of lift-based wave energy converters, only few sources of data for validation purposes are available. Therefore, two of three validation studies presented in this document are based on experimental reference cases for foils in straight flight. This approach was chosen to separate numerical modelling uncertainties due to based foil hydrodynamics from modelling uncertainties due to the circular motion of the foils. The third validation study is based on an experimental investigation in which waves radiated by a cyclorotor operating in still water were measured. Except for the first study, for which measurement data of lift and drag forces are available, the foil induced wave field at the free surface interface was used as a metric to compare numerical and experimental results. For most cases investigated, the RANS-based numerical method could produce good agreement with the absolute values recorded during the experiments. Uncertainties related to laminar-turbule [...]
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Date   2020-12-03
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