NEMO Jacobian Questions

[HyungseonSong-plasma]

I've checked invicidProjJac function in CNEMONumerics.

Invicid fluxes are $\rho_s v_s$ // blabla

Projected fluxes are $\rho_s v_s\cdot dS$

Derivatives of projected fluxes with density and momentum are understandable.
Why does NEMO not calculate derivatives of projected fluxes with energy??

$E_s = blabla + 0.5*v_s^2$

I think the derivatives exist..

$\partial \rho_s v_s / \partial \rho_s(blabla + 0.5*v_s^2) = 1/v_s$