Abstract：Fluidelastic instability (FEI) is the most serious, which could lead to tube bundle damage in short time. The numerical prediction approach is developed through the combination of theoretical modeling and CFD (Computational Fluid Dynamics) calculation. Firstly, the control equations and mathematical models of key parameters of the three most widely studied FEI theoretical models are derived based on quasi-steady theory, unsteady theory, and one-dimensional unsteady flow theory; then, the identification methods of many parameters in the theoretical model are developed. Through the simulation data-driven method, a full set of flow force related parameters are obtained. Finally, the numerical prediction method of FEI for tube bundle is established for steam generator of HPR1000. The predictions are verified with the existing test data. The results show that the numerical prediction method coupled with CFD calculation and theoretical model has certain practicability; the numerical prediction has been applied successfully in engineering and the prediction is consistent with the conclusion of the confirmatory test. The proposed method combines the advantages of theoretical modeling and CFD calculation, avoids the demand for massive computing resources, reduces the dependence on test data, and is conducive to application in engineering.
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