Reduced order model for fluid-structure coupled calculation of wind turbine blades

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 175-181.

SUN Fangjin1,2, ZHU Donghan3, ZHANG Daming4

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Abstract

Aiming at the limitation of complex and time-consuming wind turbine blade fluid-structure coupled calculation, a reduced order model of wind turbine blade weak coupling calculation was proposed. The reduced order model of air-fluid equation in fluid-structure interaction calculation was established by using the proper orthogonal decomposition (POD) method. Base mode decomposition was done for unknown variables, such as, velocity and pressure of fluid control equation using POD method and they were represented by a small part of space modes. The fluid equation was discretized in time domain. The minimum residual projection of fluid control equation was obtained by using Galerkin projection method in the existing reduced space to construct the minimum residual reduced order model of fluid equation. Then, the fluid-structure coupled calculation was performed for the fluid reduced model and wind turbine blades. The reduced order model was applied in the fluid-structure coupled calculation of the classical NREL-V wind turbine blades, temporal discretization factors of the reduced order model and the classical Galerkin method were compared, and force and deformation varying characteristics of wind turbine blade were obtained and compared with those obtained with CFD. The results showed that the reduced order model is correct and effective; compared with the computational efficiency of the full order model, the reduced order model’s is greatly improved to save much time; the reduced order model can be used to accurately and effectively perform fluid-structure coupled calculation of wind turbine blades.

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wind turbine blade / fluid-structure coupled calculation / proper orthogonal decomposition / reduced order model

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SUN Fangjin, ZHU Donghan, ZHANG Daming. Reduced order model for fluid-structure coupled calculation of wind turbine blades[J]. Journal of Vibration and Shock, 2021, 40(15): 175-181

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