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

Changing Boundary condition depend on transient result

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

Like Tree1Likes
  • 1 Post By ghorrocks

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 11, 2017, 21:24
Thumbs up Changing Boundary condition depend on transient result
  #1
New Member
 
HYUNGSIK UM
Join Date: Jun 2015
Posts: 4
Rep Power: 8
herr010 is on a distinguished road
Hello.

I want to simulate the effect of rupture disc on the exhaust pipe.

Rupture disc should be closed when the pressure is under 0.5 bar.
But after the pressure reaches 0.5 bar, the disc should be open.

How can I simulate this rupture disc?

The boundary condition will be changed wall to outlet depends on pressure near the disc.

I wander about pre setting and CEL Expression for this traisient simulation in CFX.

Thank you!!
herr010 is offline   Reply With Quote

Old   May 11, 2017, 22:31
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 16,919
Rep Power: 132
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
You could:
* Use the conditional opening feature on an interface, linked to a CEL expression which looks at the pressure
* Use a momentum source term to freeze the flow when the valve would be closed
* Model the valve directly as a rigid body simulation
herr010 likes this.
ghorrocks is offline   Reply With Quote

Reply

Tags
boundary, cel, change, rupture

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
Centrifugal fan j0hnny CFX 13 October 1, 2019 14:55
CFD analaysis of Pelton turbine amodpanthee CFX 31 April 19, 2018 19:02
Transient outlet boundary condition problem jwillie2000 CFX 1 December 7, 2009 18:07
Transient Inlet boundary condition - fully develop Omer CFX 3 November 28, 2006 17:22
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


All times are GMT -4. The time now is 08:39.