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主页 旧刊 有关人员 未来大会 American Society of Thermal and Fluids Engineering

ISSN 在线: 2379-1748

ISBN 打印: 978-1-56700-517-2 (Flash drive)

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

INCORPORATING CROSSFLOW EFFECTS INTO THE SPALART-ALLMARAS TURBULENT TRANSITION MODEL

Get access pages 1387-1396
DOI: 10.1615/TFEC2021.tfl.036522

摘要

A local correlation-based zero-equation algebraic transition model was recently proposed for aerodynamics and turbomachinery CFD applications by Cakmakcioglu et al. (2017). The model is a modification on Spalart-Allmaras model which only solves a ν-transport equation. The newly proposed transitional model includes an intermittency function instead of an intermittency equation that is found in predecessor models. The function multiplies into the turbulence production term, thus dampening it in the laminar region. The model has been shown to be more accurate and computationally more efficient than one- and two-equation transition models; while it accounts for most type of transition, however, it does not have a framework for crossflow-induced transition. This type of transition is the dominant modality in flows involving three dimensional boundary layers, such as flow around a swept wing or a turbine blade. Herein, a simple way to incorporate crossflow transition is proposed, without compromising the simplicity of the original zero-equation model formulation. The model is calibrated with experimental data for an infinite span swept wing and is shown to predict reasonably well the crossflow-induced transition phenomenon without adding any significant computational overhead.
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