Numerical Simulation of Flow-Induced Vibration of Three-Dimensional Elastic Heat Exchanger Tube Bundle Based on Fluid-Structure Coupling

Table 2

Theoretical and numerical values for the natural frequency of single-span tube.

Order	Theoretical value (hz)	Numerical calculation value (hz)	Error (%)
First-order frequency	50.189	50.596	0.81
Second-order frequency	139.38	139.12	0.19
Third-order frequency	273.25	271.88	0.50
Fourth-order frequency	451.70	447.68	0.89
Fifth-order frequency	674.76	665.70	1.34