Direct numerical simulation of fluid flow in a 5x5 square rod bundle

Kraus, Adam; Merzari, Elia; Norddine, Thomas; Marin, Oana; Benhamadouche, Sofiane

doi:10.1016/j.ijheatfluidflow.2021.108833

Cited by 16 publications

(3 citation statements)

References 43 publications

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“…Notably, there is a shift toward two-component turbulence which is not seen in the interior channels. This behavior is consistent with a gap vortex street as indicated by Merzari et al [15] and discussed further in Kraus et al [9].…”

Section: Anisotropy Invariantssupporting

confidence: 89%

“…In all plots, the coordinates begin nearest the domain center and proceed outward radially. The DNS results are also compared with LES results that were obtained on a roughly 1M element mesh in prior work [9]. Fig.…”

Section: Velocity Profilesmentioning

confidence: 93%

“…The outer wall-to-wall normal distance is 5P. The length of the domain was set at 3.158D, which was chosen based on review and on some sensitivity studies performed with an LES approach with Nek5000 [8,9].…”

Section: Computational Domain and Meshmentioning

confidence: 99%

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Direct Numerical Simulation of Fluid Flow in a 5x5 Square Rod Bundle Using Nek5000

Kraus

Merzari

Norddine

et al. 2021

Preprint

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Rod bundle flows are commonplace in nuclear engineering, and are present in light water reactors (LWRs) as well as other more advanced concepts. Inhomogeneities in the bundle cross section can lead to complex flow phenomena, including varying local conditions of turbulence. Despite the decades of numerical and experimental investigations regarding this topic, and the importance of elucidating the physics of the flow field, to date there are few publicly available direct numerical simulations (DNS) of the flow in multiple-pin rod bundles. Thus a multiplepin DNS study can provide significant value toward reaching a deeper understanding of the flow physics, as well as a reference simulation for development of various reduced-resolution analysis techniques. To this end, DNS of the flow in a square 5x5 rod bundle at Reynolds number of 19,000 has been performed using the highly-parallel spectral element code Nek5000. The geometrical dimensions were representative of typical LWR fuel designs. The DNS was designed using microscales estimated from an advanced Reynolds-Averaged Navier-Stokes (RANS) model. Characteristics of the velocity field, Reynolds stresses, and anisotropy are presented in detail for various regions of the bundle. The turbulent kinetic energy budget is also presented and discussed.

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Section: Anisotropy Invariantssupporting

confidence: 89%

Section: Velocity Profilesmentioning

confidence: 93%