- ORCAFLEX WAMIT INPUT GENERATOR
- ORCAFLEX WAMIT INPUT SOFTWARE
- ORCAFLEX WAMIT INPUT CODE
- ORCAFLEX WAMIT INPUT FREE
Detailed blade links to the hub are not modelled.
Further work includes modelling the sea surface, the water column depth, turbulence, bathymetry, and wave interaction.
ORCAFLEX WAMIT INPUT CODE
The code was used to estimate deflections, stress, fatigue, and lifetime predictions.
This was validated using data from tests at Liverpool University. Fluid-Structure interaction was modelled using Ansys, by considering a rotating fluid, rather than a rotating turbine. Tim O’Doherty (Cardiff University, Wales UK) described the CFD used to model a tidal turbine. These products are commercially available. It imports hydrodynamic data from WAMIT or their in-house hydrodynamics code, ShipMo3D. It is written in C, and can be tapped into with Java or Fortran. The lumped-mass mooring is represented with FEA, which is fully coupled with a Cummins-equation based dynamic model, with additional non-linear terms such as end-stops, power capture, or viscous terms.
ORCAFLEX WAMIT INPUT SOFTWARE
This is a non-linear equation of motion software that has a good moorings model. The power was greater than that predicted by the ACDP data because the flow 100m ahead was higher than at the turbine site, and the dynamics had not been modelled.ĭean Steinke (Dynamic Systems Analysis Ltd, Canada), presented this University Spin-off company’s floating body modelling software, ProteusDS. In the Seaflow tidal turbine project, they correlated upstream ACDP data to generated power. They are involved in a project developing real-time wave prediction, using data from a waverider buoy to predict conditions at an OWC in Spain. They do site characterisation, PLC design, and hardware in the loop testing.
ORCAFLEX WAMIT INPUT FREE
The code does not model the water free surface, but uses correction factors to account for this. They are able to model the velocity shear profile, turbulence, wakes, sensor models, electrical PTO models, structural loads, and control. They have modelled horizontal axis and vertical axis turbines, as well as oscillating hydrofoils. For modelling tidal turbines, they used a combined BEMT and CFD approach. Wave power work included the IPS buoy, the Irish OE buoy, and Wavestar. Tidal power work included Seaflow, Seagen, and Kobold I & II (a turbine for powering a village in Indonesia). Jochen Bard (Fraunhofer Institute, Germany) described the Fraunhofer Institute’s involvement in tidal and wave power research and development. Future plans for development include simulation of turbulence, downstream wake fields, and collaborative control. Present limitations are that the velocity variation due to depth is not modelled. They are planning some tow tests at sea to provide validation data. They have a sensor model that accurately reflects the amount of noise in the sensors (their ADCP data is available real-time at 1Hz). The model can deal with the 6 DoF of the floating support structure, and variation in velocity profile due to waves. James van Zwieten (Florida Atlantic University, USA) described the Southeast National Marine Renewable Energy Center's simulation of a tidal turbine using BEMT (Matlab) and lumped node simulation of mooring lines (Oraflex, called iteratively by an external C++ function). The graphs indicated that some power was lost due to the dynamic response of the support structure. Ansys was used for the fluid structure interaction analysis. The vertical axis turbine was modelled using a stream tube and vortex model. In 2008 they installed a demonstration device that looked similar to OpenHydro, and this was operational for two years. The horizontal axis turbine was modelled using BEMT. The group is presently investigating two tidal energy concepts: a horizontal axis turbine, and ship-like floating structure supporting vertical axis turbines, which are pitch controlled, and can be lifted out of the water. They have a towing tank and a large deep-water wave basin. Zhang Liang (Harbin Engineering University, China) described the University’s involvement in tidal energy research since 1982. The code may be available to others, but requires a licence. Ongoing development includes turbulence and radial flow. The code does not model the free surface or dynamic stall. It can be used to investigate cavitation and tower shadowing.
ORCAFLEX WAMIT INPUT GENERATOR
The code can model wave conditions and includes a generator model. The code finds an agreement between blade element momentum theory (BEMT) and momentum flux estimates of changes in momentum. Michael Togneri (Swansea University, Wales UK) described the development of their in-house code for modelling tidal turbines. The OES Annex V workshop on Computational Modeling and Analysis of Marine Energy Converters (25-) was organised by Roger Bagbey (Cardinal, USA) and Bob Thresher (NREL, USA), and hosted by Henry Jeffrey (The University of Edinburgh, Scotland UK).ĭay 1 was themed around the modelling of tidal stream energy converters.