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

boundary condition for compressor

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 19, 2010, 08:59
Question boundary condition for compressor
  #1
New Member
 
Krunal
Join Date: Mar 2010
Posts: 11
Rep Power: 6
krunal_me00 is on a distinguished road
hii to all.
I am doing work on FLUENT to analyze compressor with ideal gas.
but every time i am getting reversed flow or FLUENT having fatal error.
Boundary conditions I am using are:
Inlet : Pressure inlet
Outlet : pressure outlet
Solver : Density based (steady)
Hub,Shroud and side walls : Rotating (Relative to moving ref. frame; rpm=0)
Fluid : moving ref. frame (rpm = 5000)
my actual rpm is 40000 but i want to converge it first at 5000.
i am not giving any pressure or temp values at Outlet,as it should calculate on its own.Is it right??
need urgent reply...
Thank you.
krunal_me00 is offline   Reply With Quote

Old   April 19, 2010, 13:55
Default
  #2
Senior Member
 
Chris
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169
Rep Power: 7
Chris D is on a distinguished road
But if there is reversed flow, then FLUENT uses the backflow values that you set. If those values aren't realistic, it could blow out your solution.
Chris D is offline   Reply With Quote

Old   April 20, 2010, 02:57
Question boundary condition for compressor
  #3
New Member
 
Krunal
Join Date: Mar 2010
Posts: 11
Rep Power: 6
krunal_me00 is on a distinguished road
my outlet static pressure is 3.2 atm and total rpm is 40000.
if i am giving this values directly then after few iterations it shows FULENT has fatal error....
so how should i go for the solution..??
thank u..
krunal_me00 is offline   Reply With Quote

Old   April 20, 2010, 15:56
Default
  #4
Senior Member
 
Chris
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169
Rep Power: 7
Chris D is on a distinguished road
What does it say besides "Fatal Error"? Segmentation, Access_Violation? Are you using a UDF?
Chris D 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
Boundary Conditions Thomas P. Abraham Main CFD Forum 20 July 7, 2013 06:05
Transient outlet boundary condition problem jwillie2000 CFX 1 December 7, 2009 18:07
Axis Boundary Condition..what is it? CFDtoy FLUENT 6 February 13, 2007 06:51
How to set boundary condition in Fluent for the fo Peiyong FLUENT 1 November 10, 2006 12:44
How to resolve boundary condition problem? sam FLUENT 2 July 20, 2003 03:19


All times are GMT -4. The time now is 15:03.