Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
Thermal fatigue cracking can initiate in tee pipes where high and low-temperature fluids flow. A numerical fluid-structure thermal coupled simulation was conducted to investigate the penetration flow phenomenon of the mainstream into the branch pipe at a T-junction. Additionally, dynamic mode decomposition (DMD) was performed on the temperature field to analyze the factors contributing to temperature fluctuations. The penetration of high-temperature mainstream into the branch pipe caused temperature fluctuations on the pipe inner surface. Relatively high temperature fluctuations were observed on the upstream side of the branch pipe wall. DMD of the temperature field revealed a temperature fluctuation of 66 Hz at the location where the mainstream and branch pipe flows collide, and approximately half of that, 30 Hz, at the right corner. Temperature fluctuations of 5.5Hz and 0.29Hz were observed in the penetration region. The collision of waves against the right corner caused temperature fluctuations on the branch pipe wall with a relatively low frequency of 0.29Hz.
