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

Help me please

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 29, 2011, 13:25
Default Help me please
  #1
New Member
 
Lubomir
Join Date: Oct 2011
Posts: 1
Rep Power: 0
Lubomir is on a distinguished road
Hi Guys.

I have an unsolvable problem. I am beginner in CFD.
I would like to model Karman vortex trail - school experiment.

Real experiment: Pipe is placed in center of river. Behind the pipe are generated Karman vortexes. I know the velicity inlet. That´s all.

The problem: I have mesh(Gambit) of this problem, 2D solution. What are the boundary types for outlet and for two side edges?

I tried calculation but after 12000 iterations were no convergence - still oscilated.
I am not sure if I set all the parameters right.

Can You help me? Please give me advise what,where and how I must set

Thanks.
Lubomir is offline   Reply With Quote

Old   October 30, 2011, 16:25
Default
  #2
Member
 
anonym
Join Date: Mar 2009
Posts: 65
Rep Power: 8
Laci is on a distinguished road
Boundary conditions for outlet: outflow or pressure-outlet (with the proper pressure value)
The walls should be simply wall

Since the simulation of Kármán vortexes is transient, you should go for time-dependent simulation. Did you do that? From the oscillating residuals I guess you didn't.
Laci 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



All times are GMT -4. The time now is 22:20.