Reproducibility of wind velocity deficit in wake region using meteorological rans model and wind turbine model without blade rotation effect (comparison with large-eddy simulation model)

Wind speed deficit due to wake is severe problem for wind power generation. To simulate the wake effect, several types of numerical model coupled with wind turbine models have been developed. However, most of them require higher spatial resolution than meteorological models which recently used. Thus, performance of meteorological Reynolds-Averaged Navier-Stokes (RANS) model coupled with Actuator disk model without Rotation (ADM-NR), which has lower spatial resolution than that used in the previous research, is not fully investigated. In this research, reproducibility of the meteorological RANS model coupled with ADM-NR is evaluated against meteorological LES model coupled with Actuator Disk model with Rotation (ADM-R). From the comparison, it revealed that meteorological RANS model coupled with ADM-NR reproduced behavior of wind speed deficit in certain boundary layer conditions. However, turbulence intensity cannot be calculated appropriately and recovery speed from wake condition was underestimated. This result suggested that parameterization of effect of wind turbine in turbulent closure model is insufficient to simulate turbulent kinetic energy production and length scale correctly. © 2018 Japan Association for Wind Engineering. All rights reserved.