介绍了基于当地关联的γ-Reθ转捩模型,通过Spalart建议的环境源项法对自由流湍流度衰减的有效控制,实现了该转捩模型的实用化。利用中国空气动力研究与发展中心的TRIP软件平台上实现的该转捩模型,对S809翼型、NLR7301两段翼型和30P30N三段翼型3个低速翼型绕流问题进行了计算,将不同迎角下的计算结果与试验结果进行比较分析。计算结果表明:该模型可以比较准确地模拟各种外形的分离转捩与自然转捩的位置及湍流在顺压梯度区的再层流化现象,有效提高了气动力模拟的精度,具有工程应用价值;验证了TRIP软件平台上γ-Reθ转捩模型在二维问题上模拟的正确性;在中等雷诺数范围,层流区域和湍流区域有相同量级时,计算必须采用转捩模型才能准确模拟气动力。
An introduction is given to the γ-Reθ transition model based on local variables. Through the control of the free flow turbulence attenuation by Spalart’s ambient source term method, a practical transition model is achieved. Based on the transition model developed in software TRIP of China Aerodynamics Research and Development Center, the flow over low speed airfoils, including airfoil S809, NLR7301 and airfoil 30P30N, is studied. Numerical simulations and comparisons of their dynamic characteristics indicate that the transition locations of natural transition and separated transition accord with the experimental data; the relaminarization of turbulent flow along the pressure gradient zone is well simulated, and the aerodynamic simulation accuracy is effectively increased. This model may find wide application in engineering; and the correctness of the γ-Reθ transition model in software TRIP of CARDC is validated. The calculated results also indicate that while the Re number in the laminar flow corresponds to that in the turbulent flow, only the transition model can improve the precision of calculated aerodynamics.
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