NUMERICAL SIMULATION OF FLOW OVER COMPLEX TERRAIN BASED ON MODIFIED k-l TURBULENCE MODEL
In view of the demand for high accuracy of wind resource assessment,key parameters of the k-l turbulence model are modified using measured data.By adopting this methodology,the accuracy and practicality of numerical simulation for large-scale flow over complex terrain can be improved dramatically.First,the k-l turbulence model is reviewed,and appropriate grid resolution is determined.Then,the model parameters are modified based on measured data and verified using a benchmark case.Finally,a wind farm in South China is evaluated using different models to verify the effectiveness and superiority of the proposed method.The results indicate that wake effect is overestimated when the original parameters of k-l turbulence model are used,which leads to increased error.The accuracy of k-l turbulence model is improved using the parameters determined by the proposed method.The mean relative error of wind speed-up factors and AEP(Annual Energy Production)are reduced by 5.1%and 7%,respectively.In summary,the parameters of the k-l turbulence model should be modified using measured data or the order of parameter B1 should be modified to 102.
wind powerturbulence modelnumerical methodcomplex terrainmeasured data
NETL
NSTL
万方数据
