Model-form uncertainty quantification in RANS simulations of wakes and power losses in wind farms

Ali Eidi, Reza Ghiassi, Xiang I. A. Yang, Mahdi Abkar*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Abstract

Reynolds-averaged Navier-Stokes (RANS) is one of the most cost-efficient approaches to simulate wind-farm-atmosphere interactions. However, the applicability of RANS-based methods is always limited by the accuracy of turbulence closure models, which introduce various uncertainties into the models. In this study, we estimate model-form uncertainties in RANS simulations of wind farms. For this purpose, we compare different RANS models to a large-eddy simulation (LES). We find that the realizable k −ϵ model is a representative RANS model for predicting the mean velocity, the turbulence intensity, and the power losses within the wind farm. We then investigate the model-form uncertainty associated with this turbulence model by perturbing the Reynolds stress tensor. The focus is placed on perturbing the shape of the tensor represented by its eigenvalues. The results show that the perturbed RANS model successfully estimates the region bounding the LES results for quantities of interest (QoIs). We also discuss the effect of perturbation magnitude on various QoIs.

Original languageEnglish
JournalRenewable Energy
Volume179
Pages (from-to)2212-2223
Number of pages12
ISSN0960-1481
DOIs
Publication statusPublished - Dec 2021

Keywords

  • CFD RANS
  • Power deficit
  • Turbulence modeling
  • Uncertainty quantification
  • Wind-farm wakes

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