Comparative Study on Two-Equation Turbulence Models for Transonic/Supersonic Flows = Comparative Study on Two-Equation Turbulence Models for Transonic/Supersonic Flows

다국어 초록 (Multilingual Abstract)

This paper presents the comparative study of a fully coupled upwind, compressible Navier-Stokes code with three two-equation models and the Baldwin-Lomax algebraic model in predicting the transonic/supersonic flow. The k-ε turbulence model of Abe et al. performed best in predicting the pressure distribution and the velocity profiles near the flow separation over the axisymmetric bump eventhough it had some discrepancies with the experimental data in the shear-stress distributions. Additionally, it is noticeable that this model has y^* in damping functions instead of y^+. Abe et al.'s model shows better agreement in skin friction coefficient with the experiment over supersonic compression ramp. Wilcox model seems to be better than the other models regarding numerical stability; however, this model shows the sensitivity of the solution to the freestream value of the specific dissipation rate. In the overall sense, the k-ε model of Abe et al. perlormed best in predicting the complex shock-boundary layer interaction phenomena in transonic/supersonic flows over axisymmetric bump and compression ramp.

목차 (Table of Contents)

• Abstract
  
• Introduction
  
• Analysis
  
• Results and Discussion
  
• Conclusions
  
• References
  
• Fig.