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April 8, 20260 citations

Impact of Spacer Grid Geometry on Turbulence Anisotropy in Rod Bundles

Numerical assessment of spacer grid geometry on turbulence anisotropy in a rod bundle

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Authors

HCHugues ChartonEPEmmanuel Lo PintoGRGuillaume Ricciardi

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Overview

Numerical assessment evaluates turbulence anisotropy in rod bundles, indicating spacer grid design significantly affects flow stability.

Key Points

  • This study aims to quantify how different spacer grid geometries influence turbulence anisotropy in rod bundles.
  • Conducted CFD simulations using Wall-Resolved Large Eddy Simulation techniques.
  • Focused on a reduced Reynolds number of 14,000 within a simplified 5x5 rod bundle configuration.
  • Performed two sets of simulations with different spacer grid designs, one with and one without mixing vanes.
  • The spacer grid design significantly affects turbulence anisotropy, with mixing vanes leading to a more persistent anisotropic effect.
  • Turbulence anisotropy vanishes 10 hydraulic diameters downstream without mixing vanes.
  • With mixing vanes, anisotropy persists up to 15 hydraulic diameters downstream.

Cite This Study

Charton et al. (2026) studied this question.

synapsesocial.com/papers/69d5f05d74eaea4b11a79c17https://doi.org/10.1051/epjn/2026003/pdf
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