Affiliation:
1. State Key Laboratory for Mechanical Structural Strength and Vibration, Xi'an Jiaotong University, Xi'an 710049, China
2. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
Abstract
In a previous study, we developed a one-equation transition model for the bypass and laminar separation bubble (LSB)-induced transition based on local variables. In this paper, distributed surface roughness effects are taken into account by constructing a new transport equation for the roughness amplification factor Ar. Modified criteria taking account of Ar are proposed to describe the roughness effects on the bypass and LSB-induced transitions. Moreover, to predict the flow properties in the laminar–turbulent region more accurately, a modified boundary condition for rough surfaces is employed. The calculations show that, overall, the rough wall promotes the bypass transition and reduces the size, or even causes the disappearance, of the LSBs. Good agreement of the numerical results from the proposed model with the experimental data indicates that the present roughness correction formula is reasonable and accurate.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Fundamental Research Funds for the National Key Laboratory of Airfoil and Cascade Aerodynamics
Subject
Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering
Cited by
10 articles.
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