Partekatu
Izenburua
A post-processing technique for removing ‘irregular frequencies’ and other issues in the results from BEM solversEgilea
Argitalpen data
2022Argitaratzailea
European Wave and Tidal Energy ConferenceGako-hitzak
Boundary element methodsIrregular frequencies
Numerical modelling
Laburpena
Within the wave energy community, hydrodynamic coefficients obtained from boundary element methods (BEMs) are commonly used to predict the behaviour of wave energy converters (WECs) in response to inc ... [+]
Within the wave energy community, hydrodynamic coefficients obtained from boundary element methods (BEMs) are commonly used to predict the behaviour of wave energy converters (WECs) in response to incident waves. A number of commercially-available BEM solvers exist, with a number of open-source alternatives also available. While open-source solvers have an obvious cost advantage compared to their commercial counterparts, the results from such solvers are often susceptible to so-called ‘irregular frequencies’, which arise from ill-conditioning in boundary integral problems, and result in large under- or over-estimation of hydrodynamic parameters at certain excitation frequencies. Furthermore, while commercial solvers may employ techniques to suppress the effects of irregular frequencies, such solvers may, under certain circumstances, exhibit other problems in the hydrodynamic results produced. For example, the results obtained for the added mass at high frequencies, and the infinite frequency added mass for a water column, may be incorrect. The current work first focusses on an approach to remove the effects of irregular frequencies from the results obtained for the radiation damping of a particular WEC geometry. The use of radiation damping results to obtain values for the added mass, through the use of the Ogilvie relations, is then considered.
The technique described herein has been implemented in BEMRosetta, an open-source tool which allows a user to view the results from various BEM solvers, as well as converting input files between solvers. The results presented in this paper have been obtained using the BEMRosetta implementation. [-]
Argitaratzailearen bertsioa
https://doi.org/10.36688/imej.5.123-131ISSN
2631-5548Non argitaratua
International Marine Energy Journal Vol. 5. Nº 1. Pp. 123–131Dokumentu-mota
Artikulua
Bertsioa
Argitaratua
Eskubideak
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