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在CFD求解的时候各种变量，如何知道求解的矩阵是对称或不对称的？
Hi，
这和你的求解方程有关，例如：
fvm::ddt(rho) + fvc::div(U) 和 fvm::laplacian(nu, p) = fvc::div(phi)
fvm::ddt(rho) + fvc::div(U)
fvm::laplacian(nu, p) = fvc::div(phi)
是对称矩阵。更进一步的，第一个是对角阵。
fvm::ddt(U) + fvm::div(U)
则是非对称矩阵。
