LIU Jian, ZHANG Yixiong, FENG Zhipeng, YE Xianhui, CHEN Guo, QI Huanhuan. Numerical Study of Fluidelastic Instability Fluid Force Model for Normal-Triangle Tube Arrays[J]. Applied Mathematics and Mechanics, 2020, 41(5): 499-508. doi: 10.21656/1000-0887.400269
Citation: LIU Jian, ZHANG Yixiong, FENG Zhipeng, YE Xianhui, CHEN Guo, QI Huanhuan. Numerical Study of Fluidelastic Instability Fluid Force Model for Normal-Triangle Tube Arrays[J]. Applied Mathematics and Mechanics, 2020, 41(5): 499-508. doi: 10.21656/1000-0887.400269

Numerical Study of Fluidelastic Instability Fluid Force Model for Normal-Triangle Tube Arrays

doi: 10.21656/1000-0887.400269
Funds:  The National Natural Science Foundation of China(51775125;51822902;51709066)
  • Received Date: 2019-09-12
  • Rev Recd Date: 2019-12-25
  • Publish Date: 2020-05-01
  • To study the fluidelastic instability (FEI) fluid force model, the FEI process controlled by the fluid damping mechanism was taken as the research object, and the fluid-tube interaction was simulated with one elastic tube in the middle of a normal-triangle tube array under a series of free stream flow velocities. A polynomial function was chosen as the fluid force model, the simulated fluid forces and the tube displacements were used to calculate the unknown coefficients in the fluid force model. The influence of the flow velocity on the fluid force model was introduced and the relationship between fluid force coefficients and inlet flow velocities was fit. A fluid force model related to tube displacements, tube velocities and flow velocities was obtained. The predicted FEI critical flow velocities with the proposed fluid force model were compared to the experimental data and numerical results given by literatures. The fluid force model, constructed with the proposed method based on numerical results and the given mathematical function, can capture the main characteristics in the flow tube array interaction, and reasonably predict the FEI critical velocity.
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