A quadratic k-ε eddy viscosity turbulence model has been implemented in Hydra-TH, a Computational Fluid Dynamics (CFD) software being developed at Los Alamos National Laboratory, to support the thermal-hydraulics modeling needs of the CASL program. This model adopts a non-linear extension of the stress-strain relationship that allows it to capture the anisotropy of flow conditions. Modeling this behavior is essential for accurate simulation and prediction of the flow profile in fuel rod arrays, where secondary flow vortices arise and act to modify the flow profile. The model formulation and implementation in Hydra-TH is briefly discussed, followed by a validation of test cases for triangular and square rod fuel arrays.
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