Analysis of low Reynolds number turbulent flow phenomena in nuclear fuel pin subassemblies of tight lattice configuration

URANS simulation of the turbulent flow in tight lattice bundle

“…3(a)). The maximum wall shear stress appears in the widest flow region, while the maximum wall shear stress has obvious drift in DNS simulation [16]. The URANS simulations miss this monotonic trend which is also found in experiment and not fully understood yet.…”

“…Up to the present, various approaches, such Reynolds averaged Navier-Stokes (RANS), unsteady RANS (URANS), large eddy simulation (LES), and direct numerical simulations (DNS) have been used in numerical investigations to study rod bundle flows [12][13][14][15][16]. Theses works show that RANS with isotropic turbulence models will miss the anisotropy in the rod bundle.…”

Numerical simulation of heat transfer and friction in non-uniform wall roughness lattice with different roughness element shapes

“…6. This method is also mentioned by Ninokata et al (2009). The stress-omega RSM with automated wall function is employed.…”

“…The intensity of QPLSVS will be enhanced as the ratio of pitch-to-diameter (P/D) decreases (Ninokata et al, 2009). However, in some cases, it is difficult to produce the QPLSVS by decreasing P/D due to the small rod diameter, which will lead to the manufacture difficulty and mechanical instability .…”

A DNS study on the effects of streamwise convex surface curvature on coherent structures in turbulent boundary layers

“…Sub-channel modelling is often used for therm alhydraulic calculations as it is more efficient for design purposes (A hm ad and Kim, 2006). al., 2008;N inokata et al, 2009;Sreenivasulu and Prasad, 2011).…”