Comparison of numerical simulations with experimental measurements for the response of a modified submerged horizontal cylinder moored in waves

摘要

To facilitate commercially relevant numerical design\udoptimization in wave energy conversion accurate and validated\udsimulations of wave body interactions are necessary. Wave\udenergy, more so than almost any other industry, can benefit\udfrom such numerical optimization because of the high cost and\udlong period of design iteration in experimental and field testing.\udFor the foreseeable future wave energy device design and\udoptimization will continue to rely heavily on potential flow\udsolvers. Two important prerequisites to successfully using\udsimulations based on these codes are firstly a need to validate\udthe simulation implementation by comparison with experiment\udand secondly a need to supplement the potential flow solution\udwith experimentally (or CFD) derived coefficients for the\udforces that are neglected by the potential flow solver. This\udpaper attempts to address both of these prerequisites. A\udcomparison of numerical simulations and physical wave tank\udexperiments on a submerged horizontal cylinder moored in\udwaves is presented. Good agreement between numerical model\udand experiment is achieved. At operating points where the body\udresponse is linear a numerical model based purely on potential\udflow and linear mooring stiffness achieves excellent results and\udat operating points where the body response is non-linear a time\uddomain model with frequency independent quadratic damping\udis shown to give good agreement for a wide range of wave\udperiods and amplitudes.