Modelagem linear e não-linear para o tensor de Reynolds em escoamentos turbulentos em dutos

Abstract

This work presents new models to calculate the turbulent flow of Newtonian fluid in ducts. Were developed models for two methodologies for calculating the Reynolds tensor: 𝜅 − 𝜀 and 𝜅 − 𝛾̇. The first is a classical one consisting of two closing equations, while the second is a new methodology. The models of each methodology were grouped in such a way that one model is linear and three non-linear models. All models were compared with the DNS simulation results in channel and pipe flow. For (𝜅 − 𝛾̇) models equations representing the variation of relaxation factors (𝑓𝜇) were obtained with 𝑦 +.