total pressure(stagnation pressure) is changing in adiabatic nozzle
 

Hi
I am trying to solve a simple nozzle problem in Ansys FLUENT.In adiabatic nozzles Total temperature,total pressure should be constant.My solution total temperature is remains constant.But total pressure is not constant in particular place.Please see the attached image. Attachment 36241
1)can anyone clarify the reason why it is not constant?
2)How to get constant total pressure?
Thanks in advance.


Details of the problem is given below.

Geometry:Attachment 36240
Material :co2 constant specific heats, molecular weight=44.01 g/mol
density:ideal gas relation.
Model: Invicid model
Boundry condition: 1)INLET:pressure inlet=6 bar(gauge),Total temperature=427K
2)OUTLET: -6 bar(gauge)
3) operation pressure is 8 bar.

Are you using the pressure based solver or density based solver?

edit* nevermind, I see the screenshot that says dbns

I have used density based solver.

I have used density based solver

Anyone please reply to this quoted thread?? it will be very helpful to me.

hey
does happen any oblique or normal shock in the nozzle?
can you attach mach number and pressure contours!?

For the same above mentioned problem, I have changed the mesh to more fine.Here I have attached the results (plots,contour)...

1.Total pressure along the axisAttachment 36283
2.Mach no along the axis Attachment 36279
3.Pressure along the axis Attachment 36280
4.Mach no contourAttachment 36282
5.Pressure contourAttachment 36281