U-RANS simulation of unsteady eddy motion in pipe elbow at high Reynolds number conditions

Tanaka, Masaaki  ; Ohshima, Hiroyuki; Yamano, Hidemasa   ; Aizawa, Kosuke ; Fujisaki, Tatsuya*

Numerical simulations with the Unsteady Reynolds Averaged Navier Stokes equation (U-RANS) approach are examined at high Reynolds number conditions in the 1/3 scale water experiment which is a scale model of the hot-leg piping of JSFR. Applicability of the U-RANS approach to the unsteady flow through the short-elbow is confirmed and the pressure fluctuation generation mechanism in relation to the unsteady large scale eddy motion is clarified. Moreover, preliminary numerical simulation of a full-scale model of the hot-leg piping of JSFR is examined and applicability of the URANS approach to the hot-leg piping of JSFR is confirmed.