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후향계단의 비정상 난류유동 해석을 위한 DDES 격자크기 및 길이척도의 영향 분석
이충연(C.Y. Lee),박수형(S.H. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
The effects of grid size and subgrid length-scale are investigated using Delayed-Detached Eddy Simulation(DDES) based on Spalart-Allmaras(S-A) turbulence model and k-w Shear Stress Transport(SST) turbulence model. Driver & Seegmillers experimental results are used to validate the numerical results. Various grid densities and subgrid length-scale definitions are tested to investigate the effect on the numerical results. The results of the simulations shows that the volume method for subgrid length-scale is more resistant to periodic direction grid size than the maximum method: Using appropriate grid density and subgrid length-scale, both S-A based DDES and SST based DDES methods show in general good correlation with the experimental data.
이충연(C.Y. Lee),사정환(J.H. Sa),박수형(S.H. Park),이은석(E.S. Lee),이진익(J.I. Lee),이광섭(K.S. Lee) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.4
Effects of the subgrid length-scale in the Delayed-Detached Eddy Simulation(DDES) are investigated based on the Spalart-Allmaras(S-A) and the k-ω Shear Stress Transport(SST) turbulence models. Driver & Seegmillers experimental results are used to validate numerical results. Grid convergence with grid resolution and subgrid length-scale is investigated. The simulation results show that the volume method for the subgrid length-scale is more resistant to unfavorable effects of the grid size in the periodic direction than the maximum method. Using a sufficient grid resolution and an appropriate subgrid length-scale, both S-A based DDES and SST based DDES methods can provide a good correlation with the experimental data.