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• W784737306 abstract "This thesis considers the advantages of incorporating laminar kinetic energy modelling into turbulence modelling, in order to predict laminar-turbulent transition. The final aim is to implement an improved transition model into the industrial Finite-Volume code, Code Saturne. The literature review suggests that in order for a RANS-based model to predict transition accurately, modelling of complex, anisotropic phenomena is necessary. The Walters-Cokljat model is shown to compare very well to other transition modelling methods, including correlation-based modelling. The Walters-Cokljat model is a single-point RANS-based model that solves an additional transport equation for laminar kinetic energy. This transition model is especially desirable from an industrial stand-point, due to its single-point RANS basis, with only 3 transport equations. Although this method shows great promise as an industrial tool for transition prediction, results presented here show that there are aspects of the model that require modification. The definition of effective length-scale and the method of accounting for the effects of shear sheltering are the two main areas for consideration. The current definition of effective length-scale is found to be inappropriate for flows with large free-stream length-scales, which are common-place in turbomachinery applications. Another phenomenon commonly found in turbomachinery is separation-induced transition; however, the current function for shear sheltering effects inhibits transition when turbulence intensity is not the forcing factor. Additionally, when reviewed analytically, the definition and placement of the shear sheltering function does not match the observations of Jacobs and Durbin. Alternatives for the definitions of the effective length-scale and the shear sheltering function are proposed. The individual proposals are tested, and steps towards a full working implementation are documented." @default.
• W784737306 created "2016-06-24" @default.
• W784737306 creator A5087630707 @default.
• W784737306 date "2012-01-25" @default.
• W784737306 modified "2023-09-27" @default.
• W784737306 title "Laminar Kinetic Energy Modelling for Improved Laminar-Turbulent Transition Prediction" @default.
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• W784737306 hasPublicationYear "2012" @default.
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