测试数学公式

LaTex:
$$ \begin{align} \int_{V_p} \nabla \cdot (\rho \mathbf{U} \phi)dV & = \sum_f {\mathbf{S} \cdot (\rho \mathbf{U} \phi )_f } \notag \\ & = \sum_f \mathbf{S} \cdot (\rho \mathbf{U} )_f \phi_f \notag \\ & = \sum_f{F \phi_f} \label{Convection term-1} \end{align} $$

Markdown:

$$ \int_{V_p} \nabla \cdot (\rho \mathbf{U} \phi)dV & = \sum_f {\mathbf{S} \cdot (\rho \mathbf{U} \phi )_f } \notag \\ & = \sum_f \mathbf{S} \cdot (\rho \mathbf{U} )_f \phi_f \notag \\ & = \sum_f{F \phi_f} $$

$$ \phi_c = \phi_f+\psi $$

测试结果：LaTeX公式可以过，markdown多行的解析还有问题