γ-Reθt-CF转捩模型在Spalart-Allmaras湍流模型中的推广及验证
Genevalization and validation of γ-Reθt-CF transition modeling in combination with Spalart-Allmaras turbulence model
Received date: 2016-04-28
Revised date: 2016-06-25
Online published: 2016-07-18
横流（CF）不稳定性是三维流动中诱发转捩的一项非常重要的因素，考虑到γ-Reθt-CF转捩模型对流向Tollmien-Schlichting波和横流波不稳定性引起转捩的判定均是完全基于当地变量，且Spalart-Allmaras（SA）湍流模型计算效率高，因而将γ-Reθt-CF转捩模型与SA湍流模型相结合，并将其引入开源Standford University Unstructured（SU2）计算流体力学分析平台。为了考察和验证模型的预测精度，分别使用原始γ-Reθt模型和γ-Reθt-CF-SA模型，对NLF（2）-0415后掠翼型和标准6：1椭球模型进行了转捩预测数值模拟。算例结果表明，γ-Reθt-CF-SA模型的计算结果与试验数据吻合程度远远优于原始γ-Reθt模型，γ-Reθt-CF-SA模型能正确地预测出三维流动中的横流不稳定性引起转捩的现象。
鞠胜军 , 阎超 , 叶志飞 . γ-Reθt-CF转捩模型在Spalart-Allmaras湍流模型中的推广及验证[J]. 航空学报, 2017 , 38(4) : 120383 -120383 . DOI: 10.7527/S1000-6893.2016.0205
One of the major 3D transition mechanisms is transition due to crossflow (CF) instability. The γ-Reθt-CF transition model is a local correlation-based approach for prediction of transition caused either by Tollmien-Schlichting steamwise instability or crossflow instability. In order to improve the efficiency, γ-Reθt-CF-SA model is coupled with the one-equation Spalart-Allmaras (SA) turbulence model, and is then implemented in open-source Standford University Unstructured (SU2), a platform for computational fluid dynamics analyses. In order to validate and assess prediction accuracy of new model, a series of transition flows are simulated including NLF(2)-0415 swept airfoil and 6:1 prolate spheroid standard model. Computation results using γ-Reθt-CF-SA model are in good agreement with available experimental data, far superior to those using original γ-Reθt model. Model proposed can effectively predict location of crossflow instability transition.
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