在 system/fvSchemes 里,经常见到
laplacianSchemes
{
laplacian(rAU, p) Gauss linear corrected;
}
laplacianSchemes 是在 system/fvSchemes 文件里的子字典,指定 laplacian 项的离散格式,其语法是
laplacianSchemes
{
default none;
laplacian(gamma,phi) Gauss <interpolationScheme> <snGradScheme>;
}
其代表的意义是
$$
\nabla\cdot(\Gamma\nabla \phi) = \Gamma\nabla^2 \phi = \Gamma\left(\frac{\partial^2}{\partial x_1^2} \phi + \frac{\partial^2}{\partial x_2^2} \phi + \frac{\partial^2}{\partial x_3^2} \phi\right)
$$