Abstract: In this paper, computational fluid dynamics software Ansys Fluent and Ansys Workbench are used to simulate the fluid-structure interaction of tube head of fired heater, focusing on the flow field distribution at the tube head and the stress of the tube head under the effect of flow field. The results show that there is obvious drift in the fluid in horizontal manifold, which leads to the uneven distribution of flow in each branch pipe. There is vortex flow in the flow field at the straight edge of tube head, and the vortex flow always accompanies when the fluid flows to the inside of the tube head. Under the action of flow field vortex, the upper part of the center of the head is most likely to be destroyed, which is basically consistent with the actual damage position. Based on the calculation results, a solution is suggested.

Key words: tube head, fluid-structure interaction, flow field distribution, head stress, solution