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Application of U-RANS to elbow pipe flow with small curvature radius under high Reynolds number condition

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

In this study, applicability of the Unsteady Reynolds Averaged Navier-Stokes equations (U-RANS) approach with the Reynolds Stress Model (RSM) to the flow through the short-elbow under high Reynolds number condition was examined through an analysis of 1/3 scaled water experiment (mean velocity is 9.2 m/s and Re number is 3.7E+6) simulates the hot-leg piping of the JSFR. Applicable numerical options in the U-RANS approach were identified through parametric study for time integration schemes and discretization schemes comparing with the experimental results. By the numerical simulation, a dominant frequency component of the pressure fluctuation was captured and mechanism of the pressure fluctuation generation was predicted in the relation of horseshoe eddy structure and secondary flow around the elbow outlet.

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