A two-layer k-ε model is used to model a strongly heated, low-Mach number gas flowing upward in a vertical tube. Heating causes significant property variation and thickening of the viscous sublayer, consequently a fully developed flow does not evolve. Two-equation turbulence models generally perform poorly under such conditions. However, in the present work, a two-layer k-ε model is shown to accurately predict this flow through adjustment of a model constant related to the viscous sublayer thickness.

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