CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

Steam turbine, Non equilibrium case

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 20, 2013, 05:40
Default Steam turbine, Non equilibrium case
  #1
New Member
 
Join Date: Nov 2012
Posts: 26
Rep Power: 4
dmaz is on a distinguished road
Hi, I'm quite a novice in the use of Fluidodynamic software’s. I have to simulate the stream flow between the blades in a steam turbine.
I'm trying to adapt the non-Equilibrium case, as explained in the Chapter 26 of the CFX tutorials, to my CFX model(an extruded 2D model of a turbine blade).
My boundary conditions are:
Total inlet temperature: 354 K
Total inlet pressure: 0.403 bar
Static outlet temperature: 0.0662 bar

I'm using a Physical timescale of 0.0005, k-Epsilon model, a quite regular mesh.

A message appears during the setting of the CFX model:
"In Analysis 'Flow Analysis 1' - Domain 'Default Domain': This compressible multiphase simulation has a single continuous phase and uses a total pressure boundary condition. The dispersed phases will not be included in the total pressure (frozen total pressure assumption)."
What does it mean? I noticed that if I use the velocity inlet instead of the total pressure inlet, the simulation works, but I must use the Total Pressure for my simulation.
The simulation works for almost 30 Time steps, then it crashes. Suddenly the RMS P-Vol decrease and the Volume fraction of the liquid phase and the turbulence parameters have a great increase (you can see it in the attached image).
How can I fix this simulation? Where I'm doing wrong?
Thanks to everybody who will answer me!
Dmaz
Attached Images
File Type: jpg residui.jpg (17.4 KB, 5 views)
dmaz is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
CFD analysis on wind turbine rotor Ken (Wind Turbine CFD Super Rookie) Main CFD Forum 42 July 18, 2011 22:11
Developing a case from scratch luftikus OpenFOAM Running, Solving & CFD 0 May 6, 2010 14:50
Turbine spiral case postprocessing mateus FLUENT 0 April 24, 2008 03:24
Help CFX Steam turbine Yogesh CFX 2 April 26, 2006 01:38
steam turbine design sameer mohrir Main CFD Forum 4 September 24, 2000 23:29


All times are GMT -4. The time now is 23:27.