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

Compressible flow boundary conditions

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 23, 2015, 07:36
Default Compressible flow boundary conditions
  #1
New Member
 
Join Date: Oct 2015
Posts: 5
Rep Power: 10
AnaE is on a distinguished road
Hi,

I am trying to analyse the behavior of the engine exhaust gas in a structural facility, with wind conditions.

For the effect I am using compressible flow, but I am having trouble in the boundary conditions in the volume of control. I was thinking about velocity inlet and pressure outlet, however that is not valid for compressible. I have tried pressure inlet and pressure outlet, and mass flow inlet and pressure outlet however nothing is working very well.

Any suggestions?

Thank you
AnaE is offline   Reply With Quote

Old   October 24, 2015, 15:02
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,654
Rep Power: 65
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
A pressure inlet and pressure outlet pair are generally the most robust. For compressible flows you'll have to specify the inlet stagnation pressure (& stagnation temperature). If you need a particular mass-flow rate then use the target mass flow rate option on the pressure outlet. If this doesn't work, then you're probably doing something wrong.
LuckyTran is offline   Reply With Quote

Old   October 26, 2015, 08:01
Default
  #3
New Member
 
Join Date: Oct 2015
Posts: 5
Rep Power: 10
AnaE is on a distinguished road
This issue is - I do have convergence, but the problem is symmetrical and I am obtaining asymmetric results for the airflow. That only happens in 2nd order. I am using pressure standard and the results are getting better, but I don't understand the reason behind it.
AnaE is offline   Reply With Quote

Old   October 28, 2015, 10:09
Default
  #4
Senior Member
 
RodriguezFatz's Avatar
 
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 26
RodriguezFatz will become famous soon enough
Can you post some pictures?
__________________
The skeleton ran out of shampoo in the shower.
RodriguezFatz is offline   Reply With Quote

Reply

Tags
boundary conditions, compressible

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
Wind turbine simulation Saturn CFX 58 July 3, 2020 02:13
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 15:32
Radiation interface hinca CFX 15 January 26, 2014 18:11
Boundary conditions for compressible flow cici Main CFD Forum 1 April 29, 2013 02:03
compressible flow boundary conditions yangqing FLUENT 2 January 22, 2002 11:19


All times are GMT -4. The time now is 19:01.