CFD Online Logo CFD Online URL
Home > Forums > CFX

vortices do not move

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

LinkBack Thread Tools Display Modes
Old   February 1, 2011, 07:23
Default vortices do not move
New Member
Join Date: Jan 2011
Posts: 5
Rep Power: 6
va-ta-cfd is on a distinguished road
I am simulating a transient flow around a cylinder (the classical problem) with ansys-cfx12. the problem information is as follow:
cylinder diameter: 5 cm
air flow speed: 10 m/s
time step: 0.05 s
duration: 1 s
There are two main problems:
1. I can see to symmetrical vortices behind the structure in the shadow region in cfx post by velocity countors or by velocity streamline but unfortunately the vortices are steady in position and do not move by changing time step (I also have change the velocity to 20 m/s but the vortices didnt move any more)
2. CFX did not calculate helicity and i can not draw vortex core regein any more
I hope that there whould be anyone to solve my problems.
va-ta-cfd is offline   Reply With Quote

Old   February 1, 2011, 17:01
Senior Member
Join Date: Mar 2009
Location: Europe
Posts: 168
Rep Power: 8
joey2007 is on a distinguished road
How many mesh cells along the cylinder?
Please do not forget: I am not paid for answering your questions.

Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."
joey2007 is offline   Reply With Quote

Old   February 1, 2011, 17:13
New Member
Adrian Dunne
Join Date: Jan 2011
Location: Ireland
Posts: 26
Rep Power: 6
ad281 is on a distinguished road
v cccxzzzzzzzzzzzzzzzz
ad281 is offline   Reply With Quote

Old   February 1, 2011, 18:36
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 11,290
Rep Power: 88
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
ghorrocks is offline   Reply With Quote


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
Can I make a copy of a patch mesh and move it? bigphil OpenFOAM Programming & Development 0 October 13, 2010 10:29
Using CEL to make a 'flap' move bramdiff CFX 7 October 12, 2010 10:56
UDF to make a flap move bramdiff FLUENT 0 October 8, 2010 06:03
von Karman vortex street. Vortices formation mechanism. mnvl Main CFD Forum 1 February 24, 2010 18:53
counter-rotating vortices inside boundary layer Tandiono CFX 13 June 9, 2006 10:32

All times are GMT -4. The time now is 01:18.