Parameter uncertainty quantification for a four-equation transition model using a data assimilation approach
Parameter uncertainty quantification for a four-equation transition model using a data assimilation approach
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使用数据同化方法对四方程转换模型的参数不确定性量化
DOI:
10.1016/j.renene.2020.05.139
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发表时间:
2020-10
期刊:
影响因子:
8.7
通讯作者:
Xiao Zhixiang
中科院分区:
文献类型:
--
作者:
Yang Muchen;Xiao Zhixiang
A majority of the simulation discrepancies for RANS models are due to parameter uncertainties. In this paper, a data assimilation approach called the ensemble Kalman filtering (EnKF), was used to investigate the parameter uncertainties of a four-equation k-ω-γ-Artransition/turbulence integrated model. The transitional flows past two wind-turbine airfoils were analyzed, while the transition onset and end locations, as well as the skin friction coefficients, were taken as the observation variables. The results show that the posterior distributions of the parameters can be efficiently obtained through the filtering process, while the estimated parameter variations are observed among different angles of attack (AoAs), as well as different sides at the same AoA. After the EnKF analysis, the most sensitive parameter, C2, is changed into an adaptive parameter, which demonstrates the pressure gradients effects through a modified shape factor. More accurate transition locations are calculated by the adaptive C2at different AoAs for NLF(1)-0416, and on both sides for NACA-0012 than the original model having constant C2.
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