Fluent adjoint observables

Zhangmin004

I am using the ansys-fluent adjoint solver module to optimize a pipe channel. When the primary flow solution is finished, the mass-weighted average total pressure over the inlet (Pt_in_p) is 150000.0Pa. However, when i create a surface-integral observables in the adjoint module, the mass-weighted average total pressure over the inlet (Pt_in_a) is 148000.0Pa. Why is the Pt_in_p not equal to Pt_in_a? 

I sincerely hope someone could give me some tips, thanks !

DrAmine

Add screenshot. What about predicted pressure drop?

Zhangmin004

Dear Amine,

This problem has been solved, thank you very much and please forgive me for not noticing your reply.

Thank you. :-))

Zhangmin004

PS: This may be because that the total pressure is specified at the inlet (as a boundary condtion) before the primary flow solution. The Pt_in_a is nearly equal to Pt_in_p after the first solution of the adjoint equation set.