Numerical simulation of thermal striping phenomena in T-junction piping system using large eddy simulation

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

In Japan Atomic Energy Agency (JAEA), a numerical simulation program "MUGTHES (MUlti Geometry simulation code for THErmal-hydraulic and Structure heat conduction analysis in boundary fitted coordinate)" has been developed to evaluate thermal striping phenomena. MUGTHES can deal with three-dimensional transient thermal-hydraulic problem coupled with three-dimensional transient heat conduction in the surrounding structure in consideration of conjugated heat transfer. In this paper, numerical schemes for thermal-hydraulic simulation employed in MUGTHES are described including LES model. As the validation of MUGTHES, a numerical simulation of thermal striping phenomena in a T-junction piping system was conducted. The results were in good agreement with the experimental data.