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RISS 인기검색어
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- 저자 : 박수형(S. H. Park) (검색결과 109 건)
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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.
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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.
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유한요소 해석에 의한 소성가공 공정의 임계 연성파단 값의 결정
박수형(S. H. Park),이상곤(S. K. Lee),김병민(B. M. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
The occurrence of ductile fracture is the working limit of many metal forming processes. It is necessary to predict the criteria and to apply the condition in a process design. Over the years, the way for clarifying conditions have been studied and presented. However such a way needs lots of experiments and analysis. In this study, in order to determine the critical damage value of a used material Cu 4N, it was performed a tensile test and FEM analysis by using DEFORM 2D. For applying the obtained critical damage value it was also performed a upsetting test by using DEFORM 2D. The way of determining a critical damage value which is presented in this study will make possible to find easily it which is one of the working limit factor.
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압축성 박리 유동에서 Realizability 조건의 영향
박수형(S.H. Park),사정환(J.H. Sa),김지웅(J.W. Kim) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
The realizability condition has been applied to modern turbulence models. Simulations are performed to compare k-ai turbulence models imposing the realizability condition. An improvement to the k-ε turbulence model is also presented and shown to lead to better agreement with data for supersonic base flows. The improvement is achieved by imposing a grid-independent realizability constraint in the Launder-Sharma k-ε model. Numerical results for several test problems show a critical role of the realizability constraint in the prediction of separated flows.
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효율적인 Patched-grid 알고리즘을 이용한 3차원 정렬격자 생성 개선
박현돈(H.D. Park),박수형(S.H. Park) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.2
The Patched-grid algorithm code based on the time flux conservation approach has been developed to greatly reduce the number of grid points in the unnecessary region and overcome the difficulty of grid generation. For the 2-D analysis, a supersonic intake model with M = 2.41 is selected and a dense grid is efficiently generated in the flow separation area or the shock wave area. It is confirmed that the shock wave passes smoothly without discontinuous points at the interface where the grid points are mismatched. Also, it has been quantitatively proved that the fluxes at the mismatched interface are conserved even though the difference in the number of grid points between two adjacent blocks is significantly large. 3-D Patched-grid algorithm code is applied to the UCAV1303 configuration. The Patched-grid algorithm can greatly reduce the number of grid points at the far-field region while maintaining the density of grid points near the configuration.
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