The Coupling State Equations and the Symplectic Algorithm for Control Rod Drop and Fluid Flow

ZHAO Ke; CHEN Changyi; XI Yanyan; HUANG Dongwei; WU Feng; ZHONG Wanxie

doi:10.21656/1000-0887.430001

Volume 43 Issue 9

Sep. 2022

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ZHAO Ke, CHEN Changyi, XI Yanyan, HUANG Dongwei, WU Feng, ZHONG Wanxie. The Coupling State Equations and the Symplectic Algorithm for Control Rod Drop and Fluid Flow[J]. Applied Mathematics and Mechanics, 2022, 43(9): 935-943. doi: 10.21656/1000-0887.430001

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The Coupling State Equations and the Symplectic Algorithm for Control Rod Drop and Fluid Flow

doi: 10.21656/1000-0887.430001

1.
State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, Liaoning 116024, P.R.China
2.
China Nuclear Power Technology Research Institute Co. Ltd. , Shenzhen, Guangdong 518000, P.R.China

Received Date: 2022-01-04
Rev Recd Date: 2022-01-19

Available Online: 2022-09-05

Publish Date: 2022-09-30

Abstract

Abstract

The nonlinear state equations describing the coupling between control rod drop and fluid flow were proposed to solve the problem of control rod drop in nuclear reactors. The state equations have a uniform format for different fluid states in the process of control rod drop, which can conveniently deal with the problem for different working conditions. To efficiently analyze the falling process, accurately capture the sudden change of flow state and ensure the numerical stability of time integral, an adaptive time step-based symplecticity-preserving algorithm was proposed. Numerical examples show that, the proposed numerical model can accurately calculate the key data such as the displacement, the velocity, the acceleration and the falling time of the control rod in the falling process with a large time step, and the calculated results are in good agreement with those obtained the by the commercial software.
- control rod drop analysis,
- fluid-structure interaction,
- symplecticity-preserving algorithm,
- adaptive time step,
- state equation

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References(16)

References

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