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

Question on the DBFI and morpher options

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 7, 2011, 21:55
Default Question on the DBFI and morpher options
  #1
Senior Member
 
Dave
Join Date: Jul 2010
Posts: 100
Rep Power: 15
daveatstyacht is on a distinguished road
I was interested in performing a simulation involving a rigid body that is free to translate and rotate attached to an object that will deform. I was wondering is it necessary to use the DFBI morpher option or can I use the DFBI rotation and translation option with the morpher option separately for the part that deforms? If I can avoid morphing the area around the whole rigid object it will save a huge amount of computation, as most of the movement is rigid body motion while just the relative motion of the deforming part requires a deformable mesh.

Regards,
Dave
daveatstyacht is offline   Reply With Quote

Old   March 22, 2011, 16:42
Default Same problem
  #2
New Member
 
Nicholas
Join Date: May 2009
Location: Seattle, USA
Posts: 18
Rep Power: 16
nickninevah is on a distinguished road
I'm trying to do the same thing. Please let me know if you get any useful information on this. I have a set of ships rising up in a water lock. I'm trying to model it with three regions. Bottom stationary. Top region with the ships rising, and I use DFBI Translation and Rotation on them. Middle region is empty water, and it uses the DFBI Morphing to deform.

I have worked out that it needs to be DFBI Morphing for the deformable region. I tried it before with just Morphing on the middle region. Set all my boundaries to Floating. My hope was the the middle region would pick up its motions through the Interface to the top region. No luck. The middle and top regions separated and the simulation crashed.

Now, I'm trying to set it up where the middle region gets its motions from the DFBI Morphing model. And my 6DOF body is defined as the ships which are in the upper region. Problem is, I can't work out how to tell the simulation to use the 6DOF body I defined of the ships. There are no options anywhere in the simulation tree that I can find.

Maybe between the two of us, we can solve each other's problems. Hope this helps some.
nickninevah is offline   Reply With Quote

Old   March 22, 2011, 18:18
Default First Bug Found
  #3
New Member
 
Nicholas
Join Date: May 2009
Location: Seattle, USA
Posts: 18
Rep Power: 16
nickninevah is on a distinguished road
Well, I found out what the problem was. A bug with Star CCM+ 6.02. I tried running a test simulation with DFBI Morpher turned on. Boundary motion was set to use the 6DOF body motions. Ran it in Star CCM+ 5.06, and it worked just fine. Ran again in Star CCM+ 6.02, and I get the same error message I saw before.

So I would recommend you try that setup. Use Star CCM+ 5.06. For the region that shifts as a solid object, apply the DFBI Translation and Rotation model. And the deforming region, use the DFBI Morpher model, with the morphing bodies keyed to 6DOF body motions.
nickninevah 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



All times are GMT -4. The time now is 20:08.