Author Topic: Critical Evaluation and Development of One-Equation Near-Wall Turbulence Models  (Read 391 times)

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Aerospace Engineering project on Critical Evaluation and Development of One-Equation Near-Wall Turbulence Models

Abstract: A systematic analysis of one-equation near-wall turbulence models is completed and a brand new model is developed. The study includes 5 one-equation near- wall models and one two-equation model such the performance of the one-equation models may be viewed in context of the performance of this additional wide used category of models. it's found that the bulk of one-equation close to-wall models don't reproduce the variation of the painter shear stress near the wall, don't reproduce the dissipation at the wall, and don't predict the dissipation well within the region close to the wall for a physical phenomenon flow.

The new model is found to produce improved performance for the physical phenomenon and a wavy-wall channel. Specifically, it's found that the new model predicts the turbulent K.E. and dissipation in nearer agreement with direct numerical simulation information than existing one-equation models for the physical phenomenon and provides improved predictions of the shear stress distribution for the wavy-wall channel. it's found that the one-equation near-wall models typically predict the shear stress distribution for the wavy-wall channel with bigger accuracy than the two-equation model. additionally, it's shown that computations victimization the one-equation models ar less sensitive to wall spacing than those victimization the two-equation model. this means that one-equation near-wall models, and above all the new model, ar ideal for engineering computations of sensible flows wherever procedure expense is also a big issue moving into the selection of turbulence model.

Author: Diaz, Ricardo H.

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http://drum.lib.umd.edu/handle/1903/2170


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