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일반곡선 좌표계 사용시 대류항의 차분스킴에 의한 영향 평가
이연원 한국마린엔지니어링학회 1994 한국마린엔지니어링학회지 Vol.18 No.3
To develope the new simulator for the analysis of fluid flow information, the influence of various convective difference schemes were evaluated. General curvilinear coordinate system with nonorthogonal grids was adopted for the successful analysis of various complex geometries. Computation results show that if we can not obtain full grid numbers within available computational environment, we need to use higher order finite difference schemes to keep the prediction accuracy.
축대칭 선회류의 수치해석을 통한 비등방 K-ε모델의 비산형항에 나타나는 C₂계수의 최적화
李蓮源 釜山工業大學校 1993 論文集 Vol.35 No.-
To overcome weak points of the standard k-εturbulence model when applied to complex turbu-lent flows, various modified models were proposed. But their effects are confined to special flow fields. They have still some problems. Recently, an anisotropic k-εturbulence model was also pro-posed to solve the drawback of the standard k-εturbulence model. This study is concentrated on the optimization of the coefficient of C₂appearing in nonlinear terms of an anisotropic k-εturbule-nce model by the analysis of axisymmetric swirling flow.
이연원 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.5
A diffuser an important equipment to change kinetic energy into pressure energy has been studied for a long time. Though experimental and theoretical researches habe been done the understanding of energy transfer and detailed mechanism of energy dissipation is unclear. As far as numerical prediction of diffuser flows are concerned various numerical studies have also been done. On the contrary many turbulence models have constraint to the applicability of diffuser-like flows with expansion and streamline curvature. In order to obtain the reliability of k-$\varepsilon$ turbulence model modified combination turbulence models composed of the anisotropic k-$\varepsilon$model modified combination turbulence models composed of the anisotropic k-$\varepsilon$ model with Hanjalic-Launder's preferential normal strain and Pope's vortex stretching mechanism are proposed. The results of the present proposed models prove the fact that the coefficient of pressure and the shear stress are well predicted at the diffuser flow.