车辆空气动力学研究中不同湍流模型和壁面处理方法的比较

Brúnó Péter, István Lakatos
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引用次数: 0

摘要

本文采用计算流体动力学(CFD)方法研究了两种不同的湍流模型和壁面处理方法。研究使用的几何体是艾哈迈德车身。艾哈迈德车身是车辆空气动力学研究中广泛使用的几何体。该几何体代表了一种简化的车辆,使研究人员能够利用适度的资源进行研究。模拟在 Ansys Fluent 中进行。仿真环境以最大 8 GB 内存进行优化。本文研究了 k-ω SST 和 k-ε 湍流模型在低雷诺数和高雷诺数壁面处理方法中的差异。这可能是有用的,因为高雷诺数壁面处理方法所需的计算能力较低,其所需的 y+ 范围在 30 到 300 之间。而在低雷诺数壁面处理方法中,所需的 y+ 范围低于 10,这可能会增加单元数。CFD 模拟结果将与测量数据相互比较。研究的目的是了解所研究的湍流模型在低雷诺数和高雷诺数壁处理方法中的表现。
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Comparison of Different Turbulence Models and Wall Treatment Methods for Vehicle Aerodynamics Investigations
In this paper two different turbulence models and wall treatment methods were investigated with Computational Fluid Dynamics (CFD) method. The used geometry for the research was the Ahmed body. The Ahmed body is a widely used geometry in vehicle aerodynamics investigations. The geometry represents a simplified vehicle, which allows the researchers to make examinations with moderate resources. The simulations were made in Ansys Fluent. The environment of the simulation was built to optimize for maximum 8 GB RAM. The paper examines the difference between the k-ω SST and the k-ε turbulence models in the case of low and high Reynolds number wall treatment methods. This could be useful because the high Reynolds number wall treatment method needs less computational capacity based on that, its required y+ range is between 30 and 300. While in the case of the low Reynolds wall treatment method the required y+ range is below 10, which could increase the cell count. The results from the CFD simulation will be compared to each other and with measured data. The aim of the research is to get information about behaviour of the examined turbulence models in the case of low and high Reynolds number wall treatment methods.
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来源期刊
Periodica Polytechnica Transportation Engineering
Periodica Polytechnica Transportation Engineering Engineering-Automotive Engineering
CiteScore
2.60
自引率
0.00%
发文量
47
期刊介绍: Periodica Polytechnica is a publisher of the Budapest University of Technology and Economics. It publishes seven international journals (Architecture, Chemical Engineering, Civil Engineering, Electrical Engineering, Mechanical Engineering, Social and Management Sciences, Transportation Engineering). The journals have free electronic versions.
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