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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NONLINEAR TURBULENT REYNOLDS AVERAGE MODEL BASED THE NON-PERSISTENCE TENSOR
Submission Author:
Bruno Jorge Macedo dos Santos , RJ
Co-Authors:
Bruno Jorge Macedo dos Santos, Angela Nieckele
Presenter: Bruno Jorge Macedo dos Santos
doi://10.26678/ABCM.ENCIT2020.CIT20-0566
Abstract
Reynolds average turbulence models need closure equation to determine the Reynolds stress tensor with the mean kinematic tensors. Traditionally, linear models based on the Boussinesq hypothesis are employed. However, it is well known that linear models fail in several applications and different non-linear models have been proposed. In the present work, an evaluation of a nonlinear model that is based on the rate-of-strain tensor and non-persistence tensor to predict a fully developed channel flow is examined. The time average velocity filed and Reynolds Stress Tensor components are compared with DNS data. Predictions of the mean velocity and shear components of the Reynolds stress were equivalent as the one obtained with the linear model. However, an improvement is obtained with respect to the normal components. While the linear models are unable to predict them, the present model is capable of presenting a reasonable prediction of two components, but is also fails for the third one.
Keywords
Reynolds stress modeling, nonlinear turbulent model, channel flow
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