Numerical investigation on large scale eddy structure in unsteady pipe elbow flow at high Reynolds number conditions with large eddy simulation approach

Tanaka, Masaaki  ; Ohshima, Hiroyuki

A study on flow induced vibration of the primary cooling system of JSFR consisting of a large diameter pipe and a pipe elbow with short curvature radius corresponding to its diameter has been conducted. In this paper, numerical simulations for several pipe elbows with different pipe diameters and curvature radii were conducted at high Reynolds number conditions. Numerical results in each condition were compared with the experimental results in literature. Unsteady flow characteristics and pressure fluctuation generation mechanism in the short-elbow were clarified in relation to the large-scale eddy motion.