Assessment of jet turbulence model of pressure vessels inset pipe based on direct numerical simulation
The open-source software Nek5000,based on the spectral element method,was used to conduct direct numerical simulation(DNS)of the pressure vessel inset pipe.A simplified 1/3 scale pressure vessel with a main pipe Re of 63 700,a downcomer section Re of 14 014,and a flowing me-dium of sodium iodide solution were used for the simulations.Turbulent statistics were conducted on common physical quantities,leading to the construction of a highly accurate turbulent flow database.Fluent was used to conduct an adaptive assessment of common wall functions and turbulent models,with assessment criteria based on velocity,turbulent kinetic energy,and turbulent viscosity.The find-ings indicate that the Stress-ω model is optimal for the rising section,whereas the Standard k-ω model is preferable for the downcomer section.
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