> Diff(rho, t) = -(Diff(rho * u, x) + Diff(rho * v, y));

                  d         /d       \   /d       \
                  -- rho = -|-- rho u| - |-- rho v|
                  dt        \dx      /   \dy      /

> Diff(u, t) = -u * Diff(u, x) - v * Diff(u, y) + (1 / rho) * (-Diff(p, x) + Diff(tau[xx], x) + Diff(tau[yx], y));

                                /d   \   /d         \   /d         \
                               -|-- p| + |-- tau[xx]| + |-- tau[yx]|
 d         /d   \     /d   \    \dx  /   \dx        /   \dy        /
 -- u = -u |-- u| - v |-- u| + -------------------------------------
 dt        \dx  /     \dy  /                    rho

> Diff(v, y) = -u * Diff(v, x) - v * Diff(v, y) + (1 / rho) * (-Diff(p, y) + Diff(tau[xy], x) + Diff(tau[yy], y));

                                /d   \   /d         \   /d         \
                               -|-- p| + |-- tau[xy]| + |-- tau[yy]|
 d         /d   \     /d   \    \dy  /   \dx        /   \dy        /
 -- v = -u |-- v| - v |-- v| + -------------------------------------
 dy        \dx  /     \dy  /                    rho

> Diff(e + V^2 / 2, t) = -u * Diff(e + V^2 / 2, x) - v * Diff(e + V^2 / 2, y) + Diff(q, t) + (1 / rho) * (Diff(k * Diff(T, x), x) + Diff(k * Diff(T, y), y) - Diff(p * u, x) - Diff(p * v, y) + Diff(u * tau[xx], x) + Diff(u * tau[yx], y) + Diff(v * tau[xy], x) + Diff(v * tau[yy], y));

  d            2       /d            2 \     /d            2 \
  -- (e + 1/2 V ) = -u |-- (e + 1/2 V )| - v |-- (e + 1/2 V )|
  dt                   \dx             /     \dy             /

           /d   \   //d    /d   \\   /d    /d   \\   /d     \
         + |-- q| + ||-- k |-- T|| + |-- k |-- T|| - |-- p u|
           \dt  /   \\dx   \dx  //   \dy   \dy  //   \dx    /

           /d     \   /d           \   /d           \
         - |-- p v| + |-- u tau[xx]| + |-- u tau[yx]|
           \dy    /   \dx          /   \dy          /

           /d           \   /d           \\
         + |-- v tau[xy]| + |-- v tau[yy]||/rho
           \dx          /   \dy          //

>