Abstract
Computations of three-dimensional turbulent vertical up-flow of supercritical fluid in the subchannel of a heated rod bundle were made using the Computational Fluid Dynamics codes ANSYS CFX and ANSYS Fluent. Results for a total of six cases from three different sets of experiments are presented. For all six cases, steady-state predictions of fluid velocity, pressure, and temperature were made using six versions of the two-equation Reynolds-averaged Navier-Stokes turbulence models with accompanying wall treatments. A conjugate heat transfer model was used that also predicted the temperature distribution in an adjacent solid region representing a heater. In the model of one experiment, the solid region also included cladding and insulation.The k-epsilon turbulence model, implemented using CFX and Scalable Wall Functions, provided the numerical results that have the smallest overall deviation from experimental results for three of the six cases, and predicted the experimental data of the remaining four cases reasonably well, unlike other turbulence models that sometimes severely over-predict the experimental data for wall surface temperature.
Published Version
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