CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

incorrect temperature in pressure based solution

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   September 18, 2007, 23:21
Default incorrect temperature in pressure based solution
Posts: n/a

I am comparing solutions of pressure based and density based solutions for the transient case below: Inviscid flow of air (perfect gas) in a 1-meter long tube (2-D). There is no flow initially, but using tables, the mass flux and temperature uniformly increase at the inlet B.C.

Two simulations, density based and pressure based are performed using the same time step (2.0E-05) and implicit formulation. The mesh size is 500x20. Obviously there is no need to have 20 grids in the direction normal to the flow, as we are basically modelling a one-dimensional flow.

After some time (2.5 milliseconds), the profiles of pressure, density, velocity, and temperature are compared between the density based and pressure based solutions.

All match quite well, except for temperature, which has a different and incorrect trend at the pressure based solution.

Any comments? The plots are available at:

Thank you,

  Reply With Quote

Old   July 6, 2009, 05:59
New Member
Giuki Cael
Join Date: May 2009
Location: Belgium/The Netherlands
Posts: 13
Rep Power: 16
Giuki is on a distinguished road
Dear Dian,

I have the same problem, with a different case but still. I'm having a pressure inlet, using the pressure-based solver, and would like to have a temperature of 800K. But my guess is due to the pressure inlet and the temperature dependence of Cp. I get temperatures of more than 1200K at my inlet.

Have you found a solution for your problem?


Giuki is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pulsatile pressure inlet with pressure outlet a.lynchy FLUENT 3 March 23, 2012 13:45
Pressure Boundary Solution AsafPa OpenFOAM 0 October 28, 2010 09:22
Pressure temperature variation Dev CFX 0 June 21, 2007 23:01
Pressure based and Density based Solver Xobile Siemens 1 November 30, 2004 21:13
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 15:00

All times are GMT -4. The time now is 05:29.