CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Pre-Processing

Boundary conditions for RAS turbulence modeling

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 4, 2015, 10:25
Default Boundary conditions for RAS turbulence modeling
  #1
New Member
 
Join Date: Aug 2015
Location: Germany
Posts: 2
Rep Power: 0
HerrSchein is on a distinguished road
Hello everybody,

I'm new to OF and not terribly experienced in CFD in general. I'm trying to simulate a gas flow in a Pipe intersection with two outlets and one inlet. The distribution between the outlets is known so I plan to use a pressure inlet and two velocity outlets.

The solvers that I have tested so far were SimpleFoam and PimpleFoam as I figured that due to turbulence a steady state solver might cause Problems. The velocity is way below sonic speed so I'm neglecting compressibility.

I have Problems with setting up the turbulence modeling which is neccessary as the Reynold's number is at about 12000. I have tried running it with some default values that I copied from tutorials (one of them suggests a mixing length of half the channel width and a turbulence intensity of 5%). If I turn turbulence modelling on the solution will however no longer converge.

Post processing with Paraview showed that a Vortex with incredible velocity formed at the pressure inlet, causing the solver to crash at some point.

I guess the problem lies somewhere in the configuration of the turbulence modeling as without it the solution converges easily. I'd be thankful if someone could help me with setting that up. This thread might belong into the solving forum but I was not quite sure so I'll post it here.

Thanks
HerrSchein is offline   Reply With Quote

Reply

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
sliding mesh problem in CFX Saima CFX 46 September 11, 2021 08:38
Implementation of boundary conditions for FVM Tom Main CFD Forum 7 August 26, 2014 06:58
Radiation interface hinca CFX 15 January 26, 2014 18:11
v2-f turbulence model boundary conditions tstorm Main CFD Forum 1 July 19, 2010 13:15
Boundary conditions? Tom Main CFD Forum 0 November 5, 2002 02:54


All times are GMT -4. The time now is 13:03.