ANALYSIS OF TURBULENCE IN NUMERICAL MODEL FOR DETERMINATION OF WIND- POWER POTENTIAL
DOI:
https://doi.org/10.59627/cbens.2014.2252Keywords:
Turbulence Models, CFX, Wind EnergyAbstract
The choice of favorable regions for wind turbine installations is an important process and should be worked methodically. Among the models of the movement of air masses forecast, we can highlight those who work with computational fluid mechanics, where the Navier-Stokes and conservative are resolved and able to fulfill this request. Turbulence is the most difficult phenomenon to comprehend in studying the atmospheric boundary layer (ABL).It can be described as fluctuations in the flow field in space and time. The process of formation and development of turbulence is complex, since it is three dimensional, transient and has multiple scales. Moreover, it can cause significant effects on flow characteristics. When the fluid inertia forces become significant, if compared with the viscous forces, turbulence occurs and it comes in a high Reynolds number. In this paper, turbulence models based on RANS of the software Ansys CFX 11 were tested on hybrid unstructured meshes, and the results compared with experimental data on the size of the recirculation of air and velocity profiles in an elevation in the 2D triangular shape obtained by Arya and Shipman (1981) and Lee and Park (1997). Three more efficient models were tested in the fields of computing of real and complex terrain, showing good agreement with experimental data.
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References
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