Preprints
https://doi.org/10.5194/wes-2021-142
https://doi.org/10.5194/wes-2021-142
 
20 Jan 2022
20 Jan 2022
Status: this preprint is currently under review for the journal WES.

Effect of different source terms in atmospheric boundary modelling over the complex terrain site of Perdigao

Kartik Venkatraman1,2,, Trond-Ola Hågbo1,3,, Sophia Buckingham1, and Knut Erik Teigen Giljarhus3 Kartik Venkatraman et al.
  • 1von Karman Institute for Fluid Dynamics, Waterloosesteenweg 72, B-1640 Sint-Genesius-Rode, Belgium
  • 2Université de Sherbrooke, Canada
  • 3University of Stavanger, Norway
  • These authors contributed equally to this work.

Abstract. The assessment of wind conditions in complex terrain requires the use of Computational Fluid Dynamics (CFD) simulations incorporating an accurate parameterization of forest canopy effects and variable thermal stability effects. This study aims to investigate how incorporating the presence of trees can improve flow predictions. A three-dimensional steady Reynolds-averaged Navier-Stokes (RANS) equations model is set up using OpenFOAM to simulate the flow over a complex terrain site comprising two parallel ridges located near Perdigão, Portugal. A 7.5 km × 7.5 km terrain of the Perdigao site is constructed from elevation data centered around a 100 m met-mast located on the northeast ridge. A 30-min averaged stationary period corresponding to near-neutral conditions on a single met-mast tower is simulated. The impact of incorporating different source terms is studied such as forest canopy, Coriolis forces as well as also buoyancy forces. The prediction capability of the models is analyzed for different groups of towers on the South-West ridge, inside the valley, and on the North-East ridge based on the flow topology. The inclusion of a canopy model is shown to improve predictions close to the ground for most of the towers, while reducing prediction accuracy on top of the ridges, illustrating the need to represent terrain heterogeneity.

Kartik Venkatraman et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Review of wes-2021-142', Paul van der Laan, 17 Feb 2022
    • AC1: 'Reply on RC1', Kartik Venkatraman, 15 May 2022
  • RC2: 'Comment on wes-2021-142', José Carlos P. Lopes da Costa, 07 Apr 2022
    • AC2: 'Reply on RC2', Kartik Venkatraman, 15 May 2022

Kartik Venkatraman et al.

Kartik Venkatraman et al.

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Short summary
This paper is focused on the impact of modeling different effects, such as forest canopy, buoyancy, and Coriolis forces, on the wind resource over a complex terrain site located near Perdigão, Portugal. A numerical model is set up and results are compared with field measurements. The results show that including a forest canopy improves the predictions close to the ground at some locations on the site, while the model with buoyancy effects performed better at other locations.