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This has to be investigated using a natural sea state. Hence, it cannot be concluded on basis of the white noise simulation whether or not long-period oscillations or resonance will naturally develop under natural wave conditions.
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It must be stressed that since the white noise spectrum represents a synthetic sea state, the results can only be used as basis for a general assessment of the natural periods. 0.001 to 0.1 Hz).Īlthough not representing a natural sea state, a simulation with a white noise spectrum as model input can reveal in a very efficient and clear manner the resonance periods of any port or harbour layout. 0.1 m*m/Hz) on a range of frequencies (e.g. a frequency spectrum with a uniform spectral density (e.g. MIKE 21 BW, Boussinesq Waves Module, User Guide MIKE 21, Boussinesq Waves Module, Step-by-Step Training Guide MIKE 21, Boussinesq Waves Module, Scientific Documentation Link to MIKE 21 BW Model Setup Planner Link to DHI's Linear Wave Calculator Papers 'On the numerical modelling of short waves in. The model input is a so-called a white noise spectrum, i.e. The purpose of a white noise simulation in MIKE 21 BW is to investigate the potential for seiching (long wave oscillations) and assessment of the natural frequencies of an arbitrary shaped port or harbour layout. Waves: What is a white noise simulation? Answer: The hydrodynamics around single and multiple devices is obtained with MIKE 21 BW, while wave loads and motions for a single moored device are derived from ANSYS-AQWA.Ĭombining the experimental and numerical it is suggested –for both coastal protection and energy production– to adopt a staggered layout, which will maximise the devices density and minimize the marine space required for the installation.Please do not hesitate to e-mail us if you have questions and/or answers yourself: The two numerical codes have different potentialities. Furthermore, a CALM mooring system leads to lower wave transmission and also larger power production than a spread mooring. Indications on the minimum inter-distance among the devices are provided. The wave transmission behind the devices is pretty high, suggesting that the tested layout should be considered as a module of a wave farm installation. The device length should be “tuned” based on the local climate conditions. Results of the research activity are summarized in terms of device performance and guidelines for a future wave farm installation. Experimental results were also used to calibrate the numerical parameters and/or to directly been compared to numerical results, in order to extend the experimental database. The numerical simulations performed with the codes MIKE 21 BW and ANSYS-AQWA. The WEC under exam is a floating device belonging to the Wave Activated Bodies (WAB) class.Įxperimental data were performed at Aalborg University in different scales and layouts, and the performance of the models was analysed under a variety of irregular wave attacks. This research activity essentially rises due to this combined concept. WECs can be considered an innovative solution able to contribute to the green energy supply and –at the same time– to protect the rear coastal area under marine spatial planning considerations. The thesis analyses the hydrodynamic induced by an array of Wave energy Converters (WECs), under an experimental and numerical point of view.