An ANSYS-based heat exchanger tube bundle modal analysis method in a liquid filling state, relating to the technical field of designing simulation analysis methods for heat exchangers in the industry. The technical problem of being prone to heat exchanger failure accidents due to heat exchange tube vibrations induced by fluids because of ignoring the influence of inherent frequency on heat exchange during the design process of existing heat exchangers is solved by: performing a 3D modeling operation on a heat exchange tube bundle of a heat exchanger model and a housing model by means of SOLIDWORKS, and importing the models into ANSYS WORKBENCH software to define the properties of a material used for the heat exchanger structure; performing grid division on a 3D simulation model, performing a simulation operation on a CFX calculation module in the WORKBENCH software to obtain heat conduction oil temperature and pressure distribution characteristics, inputting a solution setting into the ANSYS WORKBENCH software, and setting a frequency extraction order and a solution frequency range; and analyzing the influence of a liquid on the inherent frequency and vibration type of the structure, and analyzing the influence of a liquid filling medium and temperature on the modal characteristics of a heat exchange tube bundle structure so as to provide an important dynamic basis for preventing the resonance of the structure.
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