Computational modelling of a large dimension wind farm cluster using domain coupling

The Science of Making Torque from Wind

Da Costa Gomes, V.M.M.G.^1 ; Palma, J.M.L.M.^2

Room L417, Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias s/n, Porto

4200-465, Portugal^1

Faculdade de Engenharia, Universidade Do Porto, Rua Dr. Roberto Frias s/n, Porto

4200-465, Portugal^2

关键词: Computational modelling;    Computational time;    Coupled simulation;    Domain boundary;    Flow condition;    Inlet boundary;    Large dimensions;    Wind farm clusters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082032/pdf
DOI  :  10.1088/1742-6596/753/8/082032

来源: IOP

【 摘 要 】

The accuracy of Computational Fluid Dynamics (CFD) models for Atmospheric Boundary Layer (ABL) flows relies largely on the placement of the domain boundaries and the quality of the imposed flow conditions, the inlet boundary in particular. Exploiting the parabolic nature of many ABL flows and of CFD modelled ABL flow in particular, a precursor simulation is used as source of flow data to improve the target domain's inlet flow description over the standard synthetic boundary conditions, one-directionally coupling the solutions to the two simulations. Using the approach, a case of flow over a two wind farm offshore cluster is modelled using two small coupled simulations, matching the results of a single simulation including the full cluster at a significant computational time saving, in the order of 70%. Further savings were shown to be possible by reducing the resolution of the precursor simulation, with negligible impact on the results at the target domain.