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高精度TVD有限差分格式的自由梯度条件

THE FREE-GRADIENT OF TOTAL VARIATION DIMINISHING FINITE DIFFERENCE CELL-CENTERED SCHEMES WITH HIGH ORDER OF ACCURACY
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摘要 The free-gradient is proposed for cellcentered total variation diminishing finite difference schemes of inviscid aerodynamic equations with high order of accuracy to eradicate the negative effects of the mesh skewness on the flux limiter. This paper demonstrates that it can satisfies the free-stream and free-gradient simultaneously and keeps the accuracy order of the schemes by assigning the Jacobe of transformation on the cell surfce as 1 for Harten and osher-Chakravarthy schemes. It also shows that Yee-Harten schemes do not satisfy the free-gradient, thus a modification is conducted to make them work better on skewed meshes. The free-gradient is proposed for cellcentered total variation diminishing finite difference schemes of inviscid aerodynamic equations with high order of accuracy to eradicate the negative effects of the mesh skewness on the flux limiter. This paper demonstrates that it can satisfies the free-stream and free-gradient simultaneously and keeps the accuracy order of the schemes by assigning the Jacobe of transformation on the cell surfce as 1 for Harten and osher-Chakravarthy schemes. It also shows that Yee-Harten schemes do not satisfy the free-gradient, thus a modification is conducted to make them work better on skewed meshes.
机构地区 哈尔滨工业大学
出处 《工程热物理学报》 EI CAS CSCD 北大核心 1997年第5期566-569,共4页 Journal of Engineering Thermophysics
基金 国家自然科学基金
关键词 气动方程 TVD格式 自由梯度 有限差分格式 Euler equations, TVD schemes, skewed mesh, free-gradient
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参考文献1

  • 1傅德薰,流体力学数值模拟,1993年

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