# total pressure(stagnation pressure) is changing in adiabatic nozzle

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 December 29, 2014, 06:48 total pressure(stagnation pressure) is changing in adiabatic nozzle #1 New Member   Riyaz Ahamed S Join Date: Jul 2014 Posts: 9 Rep Power: 3 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. stag pressure.jpg 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:geometry.jpg Material :co2 constant specific heats, molecular weight=44.01 g/mol density:ideal gas relation. Model: Invicid model Boundry condition: 1)INLETressure inlet=6 bar(gauge),Total temperature=427K 2)OUTLET: -6 bar(gauge) 3) operation pressure is 8 bar.

 December 29, 2014, 15:14 #2 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 606 Rep Power: 12 Are you using the pressure based solver or density based solver? edit* nevermind, I see the screenshot that says dbns

 December 29, 2014, 23:23 #3 New Member   Riyaz Ahamed S Join Date: Jul 2014 Posts: 9 Rep Power: 3 I have used density based solver.

 December 29, 2014, 23:24 #4 New Member   Riyaz Ahamed S Join Date: Jul 2014 Posts: 9 Rep Power: 3 I have used density based solver

January 1, 2015, 00:34
#5
New Member

Riyaz Ahamed S
Join Date: Jul 2014
Posts: 9
Rep Power: 3
Quote:
 Originally Posted by sriyaz 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)INLETressure inlet=6 bar(gauge),Total temperature=427K 2)OUTLET: -6 bar(gauge) 3) operation pressure is 8 bar.

 January 1, 2015, 03:37 #6 Senior Member     Amin Join Date: Oct 2013 Location: Somewhere on Earth Posts: 297 Rep Power: 5 hey does happen any oblique or normal shock in the nozzle? can you attach mach number and pressure contours!? __________________ Best regards, Amin

 January 2, 2015, 00:12 #7 New Member   Riyaz Ahamed S Join Date: Jul 2014 Posts: 9 Rep Power: 3 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 axistotal pressure.jpg 2.Mach no along the axis mach no.jpg 3.Pressure along the axis static pressure.jpg 4.Mach no contourmach no cont.jpg 5.Pressure contourpressure cont.jpg

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