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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。
The cross-flow (CF) instability is a very important factor that triggers the transition in three-dimensional flow. Considering that the γ-Reθt-CF transition model determines both the transition Tollmien-Schlichting wave and the cross-flow instability Is based entirely on local variables and the Spalart-Allmaras (SA) turbulence model is computationally efficient, combining the γ-Reθt-CF transition model with the SA turbulence model and introducing it into the open source Standford University Unstructured (SU2) Computational Fluid Dynamics Analysis platform. In order to investigate and verify the prediction accuracy of the model, the original γ-Reθt model and the γ-Reθt-CF-SA model were used to predict the transition between the NLF (2) -0415 and the standard 6: 1 ellipsoidal model Numerical Simulation. The results of the example show that the calculated results of the γ-Reθt-CF-SA model are in good agreement with the experimental data and the γ-Reθt-CF-SA model can correctly predict the crossflow in the three-dimensional flow Stability caused by the phenomenon of transition.