Physical Modelling
Large Scale tank testing is an important next stage in developing efficient OWC wave energy converters due to the relative influences of forces at different scales. In a large scale test, many variables are measured which can then be compared to values predicted by theory and small scale testing.
Testing physical models in this way is useful for a number of reasons: - Model is tested in an accessible, controlled and repeatable manner - It ensures theoretical and analytical predictions on scaling effects and other uncertainties match experimental values - Reduces risk when building full scale models - Cheap compared to sea trials [1] |
In most cases, parts of the full scale device are simplified - e.g. an orifice instead of a turbine for the power take-off - and the models are generally used to investigate certain aspects such as: Hydrodynamics, stability/mooring, power take-off systems and associated control devices, and power capture characteristics.
One of the first tasks in planning for physical model testing is figuring out which modelling laws are required for the system to be investigated. To achieve an appropriate similarity between the scale model and the full scale device there are some requirements which should be satisfied, i.e. geometric similarity, hydrodynamic similarity (Froude, Strouhal, Reynolds) and structural similarity (Cauchy). If any of these requirements are not satisfied then results and conclusions drawn from the experiments may be flawed. [3]
One of the first tasks in planning for physical model testing is figuring out which modelling laws are required for the system to be investigated. To achieve an appropriate similarity between the scale model and the full scale device there are some requirements which should be satisfied, i.e. geometric similarity, hydrodynamic similarity (Froude, Strouhal, Reynolds) and structural similarity (Cauchy). If any of these requirements are not satisfied then results and conclusions drawn from the experiments may be flawed. [3]
For more information on scaling please follow this link:
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