Category Archives: Computational model

UNH-RVAT Reynolds number dependence experiment

Researchers, Peter Bachant and Martin Wosnik,  of the Center for Ocean Renewable Energy at the University of New Hampshire  “investigated—experimentally and numerically—the effects of Reynolds number on the performance and near-wake characteristics of a 3-bladed cross-flow turbine” For more info, see their METS paper.

Their are releasing the processing and plotting code, as well as the derived dataset from the UNH-RVAT Reynolds for free on GitHub: github.com/UNH-CORE/RVAT-Re-dep

 

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turbinesFOAM

turbinesFoam is a library for simulating wind and marine hydrokinetic turbines in OpenFOAM (2.3.x). Some components for solvers and turbine models have been taken from NREL’s SOWFA and Offwind.

Get it on GitHub: github.com/turbinesFoam/turbinesFoam

This library is in heavy development and is not yet fully functional, but pull requests are encouraged!

For now, check out their videos:

Wave Farm Code – mwave

bitmap

Wave energy converters (WECs) will be deployed in groups or “wave farms”. The hydrodynamic interactions between WECs in a wave farm (i.e. how waves that are absorbed, scattered, or radiated by one WEC affect the others) will have siginificant impacts on the overall power performance of the wave farm.

A recently published paper by researchers at The University of Edinburgh titled “A novel method for deriving the diffraction transfer matrix and its application to multi-body interactions in water waves” presents a new method for computing wave farm performance with results from commercial software. Using the theory, WEC array interactions can be computed on the order of 1,000-10,000 times faster than with standard methods.  However, the method presented in the paper is still somewhat complicated to implement, which would make it difficult for others to employ it.

Open source to the rescue! The authors have chosen to share the wave farm code used in the paper for free. The Matlab package that they developed, including examples of WEC array performance, can be found on GitHub:

mwave

The authors chose to release the code to increase the impact of the work. The code is already being used by another researcher at Oregon State University as part of his wave farm design optimization work and is being evaluated for use by the International DTOcean project, which “aims at accelerating the industrial development of ocean energy power generation knowledge, and providing design tools for deploying the first generation of wave and tidal energy converter arrays.”

ROMS-Tidal-Array

In an effort to accelerate the growth of the tidal energy industry through knowledge sharing and open source initiatives, IT Power Ltd. has the great pleasure to announce the release of ROMS-Tidal-Array (Beta version). This patch can be installed into the Regional Ocean Modeling System (ROMS) software and provides a tool to model tidal turbine arrays based on a tidal turbine parameterisation method, accounting for the momentum capture as well as the sub-grid scale turbulence balance perturbations for each individual device. This modelling tool enables accurate analysing the flow characteristics for impact and resource assessment purposes for reasonable computational costs and therefore enables the use of optimisation strategies to assess different layouts. ROMS Tidal Array can be downloaded from this link.