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看rho迭代0次呢?
diagonal是对角矩阵求解器。
fvScalarMatrix rhoEqn ( fvm::ddt(rho) + fvc::div(phi) == fvOptions(rho) );
从这个方程里面可以看出,只有时间项是隐式离散,fvc和fvOptions都进入了矩阵右边。因此离散之后是一个对角阵。直接除过去就可以。并不需要迭代。因此迭代数为0.