|The Performance Assessment of Wave and Tidal Array Systems (PerAWaT) project, launched in October 2009 with £8m of ETI investment. The project delivered validated, commercial software tools capable of significantly reducing the levels of uncertainty associated with predicting the energy yield of major wave and tidal stream energy arrays. It also produced information that will help reduce commercial risk of future large scale wave and tidal array developments.
This deliverable describes the results associated with a linear and weakly nonlinear potential flow, hydrodynamic formulation, applied to an isolated truncated cylinder (point absorber device type) free to move in all degrees of freedom (DOFs). Plus to four cylinders arranged in a square (2x2) array. The review presented in this document is mostly focused on the methods available in WAMIT, which was used in this study to compute the first and second-order hydrodynamic forces and the unrestrained motions associated with a single cylinder and an array with four cylinders in regular and irregular waves.
The report consists of:
- Section 1: Scope of the documents and its key objectives
- Section 2: Brief introduction to potential flow theory and the difficulties associated with a fully non-linear implementation
- Section 3: Brief description of first order hydrodynamic formulations
- Section 4: Detailed description of the second-order (weakly) nonlinear hydrodynamic formulation
- Section 5: Stochastic approach used to obtain irregular wave results
- Section 6: Linear and weakly non-linear hydrodynamic results associated with a single truncated cylinder WEC free to move in all DOFs
- Section 7: An extension of the linear and weakly nonlinear resultsto an array with four cylinders WEC free to move in all DOFs
- Section 8: The next steps in terms of the implementation