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Thermal mixing in T-junction piping system related to high-cycle thermal fatigue in structure

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

Numerical simulation of thermal striping phenomena in a T-junction piping system (JAEA WATLON experiment) was conducted by using the numerical simulation code "MUGTHES", which has been developed at JAEA. MUGTHES employs the large eddy simulation (LES) approach and standard Smagorinsky model as a turbulence eddy viscosity model with the model coefficient of 0.14 (=$$Cs$$). Numerical results were validated by comparisons with the experimental results of velocity and temperature. Applicability of MUGTHES to the thermal striping phenomena in the T-pipe was confirmed and the characteristic large-scale hairpin vortex structure which dominates thermal mixing and may cause high-cycle thermal fatigue was revealed.

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Category:Nuclear Science & Technology

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