Simulation Study on Fluid-elastic Instability of Two-Dimensional Tube Bundle Based on UDF

Tan Wei; Zhao Chengzhuo; Huang Xuan; Shen Pingchuan; Zhang Ke; Zhu Guorui

doi:10.13832/j.jnpe.2022.05.0195

Volume 43 Issue 5

Oct. 2022

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Article Navigation > Nuclear Power Engineering > 2022 > 43(5): 195-202

Tan Wei, Zhao Chengzhuo, Huang Xuan, Shen Pingchuan, Zhang Ke, Zhu Guorui. Simulation Study on Fluid-elastic Instability of Two-Dimensional Tube Bundle Based on UDF[J]. Nuclear Power Engineering, 2022, 43(5): 195-202. doi: 10.13832/j.jnpe.2022.05.0195

Citation:

Tan Wei, Zhao Chengzhuo, Huang Xuan, Shen Pingchuan, Zhang Ke, Zhu Guorui. Simulation Study on Fluid-elastic Instability of Two-Dimensional Tube Bundle Based on UDF[J]. Nuclear Power Engineering, 2022, 43(5): 195-202. doi: 10.13832/j.jnpe.2022.05.0195

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Simulation Study on Fluid-elastic Instability of Two-Dimensional Tube Bundle Based on UDF

doi: 10.13832/j.jnpe.2022.05.0195

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
2.
Zhejiang Institute of Tianjin University, Ningbo, Zhejiang, 315201, China
3.
Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2021-11-04
Rev Recd Date: 2022-03-16
Publish Date: 2022-10-12

Abstract

Abstract

In view of the low calculation accuracy and huge calculation cost of the existing fluid-solid coupling model in the simulation study of fluid-elastic instability, a two-dimensional unidirectional fluid-solid coupling model which can predict the critical velocity of tube bundle is established. This model is based on the commercial ANSYS Fluent software, the flow field is calculated by the SST k-ω turbulence model, and then the fluid force on the tube is extracted by a self-compiled user-defined function (UDF), and the fourth-order Runge-Kutta method is used to solve the structural dynamic equation and realize the unidirectional fluid-solid coupling calculation. Using this model, the fluid-solid coupling calculation is carried out on the triangularly-arranged tube bundle with a pitch-diameter ratio of 1.5, and the critical velocity, the amplitude time-history curve and the amplitude spectrum of the central tube are obtained, which are verified by water tunnel experiments.The results show that this model can accurately predict the critical velocity with low calculation cost, and also obtain the true vibration characteristics of the tube. The amplitude time-history curve and amplitude spectrum of the central tube calculated by simulation are similar to those of the experiment.In addition, the resistance and lift coefficient data obtained by simulation calculation show that the resistance and lift coefficient time-history curves change from disorder to regularity with the increase of the velocity. When the converted velocity reaches 2.44, the main frequency of the resistance and lift coefficient includes the component of the natural frequency of the tube in still water.
- Fluid-elastic instability,
- Tube bundle,
- Fluid-solid coupling,
- Critical velocity

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References(13)

References

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