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Report No.
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Thermal mixing in T-junction piping system concerned with high-cycle thermal fatigue in structure

Tanaka, Masaaki; Ohshima, Hiroyuki; Monji, Hideaki*

Numerical simulation of thermal striping phenomena in a T-junction piping system is conducted using a numerical simulation code "MUGTHES". Standard Smagorinsky model is employed as eddy viscosity model with the model coefficient of 0.14 (=Cs). Numerical results are verified by the comparisons with experimental results of velocity and temperature. Applicability of MUGTHES to the thermal striping phenomena is confirmed and the characteristic large-scale eddy structure which dominates thermal mixing and may cause high-cycle thermal fatigue is revealed.

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