超声速湍流密度脉动预测的神经网络方法

doi:10.7527/S1000-6893.2018.22244

Abstract

Abstract: Considering the demand for predicting density fluctuation in turbulence of in prediction of the aero-optical effect, this paper develops a neural network method to predict the density fluctuation in supersonic turbulence. A model for the density fluctuation with 5 hidden layers is built by mining the regularity from the flow field data of supersonic turbulent boundary layers, which are simulated by the Direct Numerical Simulation (DNS) method. The experimental results show that the neural network method proposed is able to predict the mean square values of density fluctuation accurately. The method can predict the training samples well, and can get the prediction of test samples with better accuracy and stability than traditional models, and has certain capability of generalization. By selecting features and adding prior information, the 7 features of input parameters of the density fluctuation model are determined to further improve the capability of generalization and practicability of the model.

Key words: aero-optics, turbulence, density fluctuation, neural network, boundary layer

CLC Number:

V211.3

WANG Zhengkui, JIN Xuhong, ZHU Zhibin, CHENG Xiaoli. Neural network method for predicting density fluctuations in supersonic turbulence[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(10): 122244-122244.

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Neural network method for predicting density fluctuations in supersonic turbulence

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