Getting problem to write a flux term codes in DG of Navier-stokes

[Monirul25 (Monirul)]

Dear all experts and respected professors, i am getting problem to write the FF++ code of the following flux of F in the FF++:

(Getting problem to write second term and third term in FF++ code also third term is non-linear)

Here, is the details paper:
DDG of NS 2019.pdf (7.1 MB)

I have tried to write in the following way but not getting:

Thanks in advance!.