CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Closed rotating tank with free surface

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

LinkBack Thread Tools Display Modes
Old   October 10, 2007, 09:01
Default Closed rotating tank with free surface
Juan Catelén
Posts: n/a
I'm trying to model something simple: a tank rotating (2.5 rev/seg)with water filling 75% of height at the beginning. I'm using SSG turbulence model(because I undestand that k-e is not useful in these cases), an hexaedric mesh and a standard free surface model. I'm having problems always. Or I get an error saying that the program can't find the "Effvisc" or after 15 iterations I get floating point exception-overflow (even using the upwind scheme). To fix the velocity I tried rotating the mesh and also choosing rotating walls, but I got the same errors. What could be wrong? Thanks in advance.
  Reply With Quote

Old   October 10, 2007, 18:59
Default Re: Closed rotating tank with free surface
Glenn Horrocks
Posts: n/a

RSM turbulence models are much harder to converge than the 2-equation models. Make sure you have the best quality mesh you can do, and use fine timesteps to start it off.

You might also start the simulation with k-e or SST and restart changing to SSG after the flow is settled down to make it easier for the SSG model.

Glenn Horrocks
  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
CFX convergence issues with free surface adenlan CFX 3 September 2, 2011 06:43
Linear analytical solution oto the 2D free sloshing water surface elevation bearcat Main CFD Forum 7 August 5, 2011 20:13
The problem about free surface in a rotating cylin Thomas huang CFX 1 May 16, 2006 06:11
Code with reliable free surface capability in a rotating system Subhasish Roy Choudhury Main CFD Forum 1 September 4, 1998 18:47
Modeling Free Surface Flows Elliot Schwartz Main CFD Forum 5 August 25, 1998 21:03

All times are GMT -4. The time now is 10:04.