[roberthino]

hi everybody, me again with a problem :-)
i now try to run my rans channel flow with cyclic boundary conditions, therefor i have to ad an extra term to the u eq in simpleFoam.C to keep a constant pressure gradient along the channel.
i really dont have a clue how to modify the u eq. i tried to do it like this:
fvVectorMatrix UEqn
(
fvm::ddt(U)
+ fvm::div(phi, U)
+ 0.018
);

where 0.018 is the constant. this isnt working and it isnt compiling. maybe someone can help and tell me how to exactly implement the term.
thx
greetings robert