Turbulent simulations are performed for model- and full-scale hydrokinetic turbine using rotating blade using solution adapted grids up to 8.8M cells. The performance characteristics at both scales, and intermediate wake predictions at model-scale are validated using experimental data, and the effect of grids, turbulence modeling, scale and stanchion on the wake recovery is evaluated. The thrust and power predictions compare within 5% of the experimental data. LES performs better than other models for the wake prediction, and the averaged error is 7% and 30% in the near and intermediate wake, respectively. The large errors in the intermediate wake are due to poor predictions of cross plane turbulent fluctuations, which results in the under prediction of the wake diffusion. The wake deficit increases due to the effect of stanchion, and increase in Re. The far-wake shows a Gaussian profile, whose width and amplitude show linear increase and decrease, respectively, with progression.
|Commitee:||Thompson, David S., Walters, Keith D.|
|School:||Mississippi State University|
|School Location:||United States -- Mississippi|
|Source:||MAI 56/02M(E), Masters Abstracts International|
|Subjects:||Ocean engineering, Mechanical engineering|
|Keywords:||Computational fluid dynamics, Effect of support structure, Effect of turbulence modeling, Intermediate wake analysis, Reynold's number effects|
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