anisotropic diffusion equation 各向异向扩散方程 Radiation diffusion equation 辐射热传导方程 nonlinear diffusion equation 非线性扩散方程 ..
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但是由于辐射热传导方程具有很强的非线性，其精确的解析解很难求出。
However, accurate analytic diffusion wave solutions are difficult to obtain due to the strong nonlinearity of the radiation diffusion equation.
本文针对二维三温辐射热传导方程的两种简化模型的有限元方程，讨论了两层网格方法。
In this paper, using the finite element method, we discuss the two-grid methods for two simplified models.
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