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

Can I impose 2 boundary conditions in CFX Pre?

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 6, 2006, 12:43
Default Can I impose 2 boundary conditions in CFX Pre?
  #1
Alexxx
Guest
 
Posts: n/a
I've tried to input both pressure and velocity in the inlet of a pipe, but error message shown.

Is it acceptable to impose 2 or more conditions in CFX Pre, or do I have to create more than one domain?
  Reply With Quote

Old   November 6, 2006, 14:09
Default Re: Can I impose 2 boundary conditions in CFX Pre?
  #2
opaque
Guest
 
Posts: n/a
Dear Alexx,

If your flow is supersonic you must set both conditions. Otherwise, you will have an ill-posed problem.. You cannot set two boundary conditions for the same physics at the same boundary. Imagine trying to set the heat flux and the temperature at the same location..

If you explain what you are trying to model, other members can help you find out the proper set of boundary conditions..

Opaque

  Reply With Quote

Old   November 8, 2006, 10:35
Default Re: Can I impose 2 boundary conditions in CFX Pre?
  #3
Alexxx
Guest
 
Posts: n/a
Thx Opaque.

In fact I'm a beginner in CFX. I want to simulate that pressure gradient is constant along a circular pipe carrying laminar flow of water. I also want to see the velocity profile in the cross section in fully developed region.

If I have an analytical solution, is that no matter what properties I set as the boundary conditions, the result would be the same?
  Reply With Quote

Old   November 17, 2006, 02:28
Default Re: Can I impose 2 boundary conditions in CFX Pre?
  #4
HekLeR
Guest
 
Posts: n/a
In cfx 10 you need to use a translationally periodic domain inteface plus a momentum source to set the pressure gradient.

In cfx 11 you can use the pressure change/drop condition with translational peridocity.
  Reply With Quote

Reply


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 60 July 17, 2024 06:45
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 06:21
Setting Pressure Boundary Conditions in ANSYS CFX Pre saisanthoshm88 CFX 21 February 22, 2017 17:50
non reflective boundary conditions for incompresible flow Pascal_doran OpenFOAM Programming & Development 16 August 25, 2015 06:35
Boundary conditions? Tom Main CFD Forum 0 November 5, 2002 02:54


All times are GMT -4. The time now is 16:41.