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Turbulence model for Natural circulation

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Old   August 16, 2014, 12:23
Default Turbulence model for Natural circulation
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I am simulating a natural circulation loop using RNG turbulence model in FLUENT. Will it consider the effects of initial laminar, transition and turbulent regime behavior as the flow initiates from rest ? If yes then what should I give as inputs to boundary conditions as it asks for turbulence specification method for initially stagnant fluid.
Please reply. Thanks in advance.
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