Numerical Investigation on Unsteady Simulation Method for Wind Turbine
The dynamic mesh for blade motion simulation in unsteady numerical simulation of wind turbines is one of challenges in the use of CFD methods.In order to investigate differences in the application of sliding mesh and overset mesh in the unsteady simulation of wind turbines,this paper uses two methods for the unsteady aerodynamic simulation of fixed and floating wind turbines.Using snappyHexMesh to generate meshes and ensuring consistency in the rotating domain,the overall performance,spanwise aerodynamic characteristics,and wake characteristics are compared.The results indicate that for both fixed and floating wind turbines,the power calculated by the overset mesh method is higher than that by the sliding mesh method;Along the blade span,from the root to the tip,the low pressure range of the suction surface gradually increases,and the pressure on the pressure surface gradually increases.The results of the overset mesh for the surface pressure difference of the spanwise section airfoil are higher than that of the sliding mesh,which is the direct reason for the higher overall performance calculation results of wind turbine;The wind speed at the center of the blade root and hub simulated by the sliding mesh is lower than that of the overset mesh,and higher at the blade tip than that of the overset mesh.
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