Journal of computational fluids engineering (한국전산유체공학회지)
- Volume 6 Issue 4
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- Pages.15-25
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- 2001
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- 1598-6071(pISSN)
Prediction of the Diffusion Controlled Boundary Layer Transition with an Adaptive Grid
적응격자계를 이용한 경계층의 확산제어천이 예측
Abstract
Numerical prediction of the diffusion controlled transition in a turbine gas pass is important because it can change the local heat transfer rate over a turbine blade as much as three times. In this study, the gas flow over turbine blade is simplified to the flat plate boundary layer, and an adaptive grid scheme redistributing grid points within the computation domain is proposed with a great emphasis on the construction of the grid control function. The function is sensitized to the second invariant of the mean strain tensor, its spatial gradient, and the interaction of pressure gradient and flow deformation. The transition process is assumed to be described with a κ-ε turbulence model. An elliptic solver is employed to integrate governing equations. Numerical results show that the proposed adaptive grid scheme is very effective in obtaining grid independent numerical solution with a very low grid number. It is expected that present scheme is helpful in predicting actual flow within a turbine to improve computation efficiency.
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