Adam H. Richards and Robert E. Spall
Turbulence modelling, computational fluid dynamics, heat transfer
A one-equation near-wall turbulence model is used to predict a strongly heated, low-Mach-number gas flowing upward in a vertical tube. Intense wall heating causes significant and continuous fluid property variation and thickening of the viscous sub-layer. Consequently, a fully developed flow does not evolve. Existing literature reveals that two-equation models with various near-wall approaches generally perform poorly under such conditions. However, the one-equation model considered in this study is shown to accurately predict this flow through adjustment of a model constant related to the viscous sub-layer thickness.
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