5 research outputs found
γ-Reθ 천이 모델을 사용한 KARI-11-180 익형의 천이 유동해석
n this study, numerical simulations were performed using the γ-Reθ transition model of KFLOW for the transitional flow over the KARI-11-180 airfoil. Numerical results of KFLOW were compared with experimental data and two other numerical results of XFoil and MSES. Fully turbulence model was predicted high skin friction drag than transition model because fully turbulence model could not solve the transitional flow. Numerical predictions using the γ-Reθ model of KFLOW show a good agreement with experimental data and other numerical results. Present numerical results were confirmed the state of drag bucket due to dramatic changing of the transition location on the airfoil surface
Delayed detached-eddy simulation of vortex breakdown over a 70° delta wing
To investigate the vortex breakdown over the ONERA70 delta wing at an angle-of-attack of 27°, unsteady simulations were performedusing Reynolds-averaged Navier-Stokes and Spalart-Allmaras delayed detached-eddy simulations. A low-diffusive preconditioned Roescheme with third-order MUSCL interpolation scheme was applied, along with second-order dual-time stepping combined with diagonalizedalternating direction implicit method for unsteady simulation. Vortex breakdown was investigated through an examination oftotal pressure loss, axial velocity, and axial vorticity around the primary vortex. Delayed dtached-eddy simulation provided good agreementwith experimental data and predicted all physical phenomena related to vortex breakdown well
