耦合聚类的数据驱动稀薄流非线性本构计算方法

doi:10.7527/S1000-6893.2022.27708

Abstract

Abstract:

Owing to the rarefied nonequilibrium effect encountered in near space environment， the existing numerical methods are difficult to describe the multi-scale flow phenomena efficiently and accurately at the same time. By integrating the machine learning methods proposed in recent years， Data-driven Nonlinear Constitutive Relations （DNCR） presented a new data-driven modeling approach for solving the nonequilibrium problem. To further improve the generalization capability and model training efficiency of the DNCR method， Gaussian Mixture Model （GMM） and Sparse Principal Component Analysis （SPCA） for preprocessing the data of training set and prediction set are introduced to the DNCR method for the first time in this paper. The prediction results of relevant cases show that the dominant parameters in different flow fields are extracted by GMM and SPCA without relying on artificial experience， which could improve the interpretability and robustness of DNCR. On the other hand， GMM and SPCA can accurately cluster the data points under a large number of flow field samples to eliminate the interference of redundant information and reduce the training and prediction time of the regression model， which is crucial to the updating and maintenance of the model when adding new sample data in future. For prediction accuracy， the coupled DNCR could improve the computational efficiency without losing accuracy in simple flows， and could further elevate the precision significantly in complex flows coupled with different flow characteristics.

Key words: Gaussian mixture model, sparse principal component analysis, data driven, tree model, rarefied non-equilibrium flow

CLC Number:

V211.3

Shaobo YAO, Lijian JIANG, Wenwen ZHAO, Zheng LU, Changju WU, Weifang CHEN. Numerical method of data-driven rarefied nonlinear constitutive relations coupled with clustering[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(S2): 40-53.

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References 29

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外形	来流压力P/Pa	来流马赫数Ma
1.1	0.186 2	3
1.1	0.186 2	5
1.1	0.279 3	5
1.1	0.465 5	5
1.2	0.058 2	10
1.2	0.038 8	10

模型	平均训练时间/s	平均预测时间/s
GMM+SPAC	7.12	0.014
原始回归模型	127.97	2.34
聚类后回归模型1	4.88	0.44
聚类后回归模型2	16.64	预测集无此簇数据
聚类后回归模型3	28.26	1.15
聚类后回归模型4	52.66	1.18
聚类后回归模型5	8.48	预测集无此簇数据

外形	来流压力P/Pa	来流马赫数Ma
2.1	0.05	3
2.2	0.05	3
2.2	0.06	3

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Numerical method of data-driven rarefied nonlinear constitutive relations coupled with clustering

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