simulation
 

I am modeling, the height of the inlet flow is 0.12 cm and after that the height of the flow becomes more than 0.12 cm, I get a special pressure with a height of 0.12 cm at the outlet, it causes an error in the modeling. What should I do to keep the flow height constant?
Thank

What is the max z of your mesh block? It should be bigger that 0.1. Did you use time dependent fluid elevation table at your inlet BC?

Thanks
max z is symmetry and mesh height 0.21 m
I didn't use