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

Deformed Mesh in DFBI

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 15, 2021, 12:48
Default Deformed Mesh in DFBI
  #1
New Member
 
Will Crawford-Jones
Join Date: Jan 2021
Posts: 19
Rep Power: 2
wcj1n18 is on a distinguished road
Hi,

I'm trying to model a sphere rolling over some other spheres in open channel flow (see attached image "Geometry_Scene_1_image_1.500000e-03.png"). I have set up a DFBI model- under [tools < motions] I have included DFBI Rotation and Translation (which enables 6 DOF movement of a body) and DFBI Morphing (which I understand is for the morphing of the mesh). I have set up a contact coupling such that the sphere does not 'move into' the lower spheres and cause an error.

Firstly, I ran the simulation and noticed that the cells did not seem to get refined and between the moving sphere and the left base sphere became stretched (see attached image "Geometry_Scene_1_image_2.000000e-03.png"- they progressively became more stretched than this). Anyway, I eventually encountered a negative cell volume error.

I then explored the Adaptive Mesh feature and set Adaptation Requests to various mesh metrics (cell quality, aspect ratio etc). However, the cells continue to stretched and I encounter a negative cell volume error even quicker than before.

My question is: how do I set up an adaptive mesh for my case of a translating and rotating sphere; as the sphere moves away from the bottom left sphere I would need new cells to be created rather than stretched. Also, I would need the cells downstream to be removed as they become compressed. At the moment, cells are stretching and I am getting negative cell volume errors as well.

Thanks a lot

Will
Attached Images
File Type: jpg Geometry_Scene_1_image_1.500000e-03.jpg (128.4 KB, 8 views)
File Type: png Geometry_Scene_1_image_2.000000e-03.png (136.2 KB, 7 views)
wcj1n18 is offline   Reply With Quote

Old   March 18, 2021, 04:54
Default
  #2
New Member
 
Will Crawford-Jones
Join Date: Jan 2021
Posts: 19
Rep Power: 2
wcj1n18 is on a distinguished road
Hello,

Anyone have any ideas with this please? Any help you can give would be great

Thank you!
wcj1n18 is offline   Reply With Quote

Reply

Tags
6 dof, dfbi morphing, open channel flow

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
foam-extend-4.1 release hjasak OpenFOAM Announcements from Other Sources 18 February 9, 2021 06:25
[snappyHexMesh] No layers in a small gap bobburnquist OpenFOAM Meshing & Mesh Conversion 6 August 26, 2015 09:38
3D Hybrid Mesh Errors DarrenC ANSYS Meshing & Geometry 11 August 5, 2013 06:42
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
[Gmsh] 2D Mesh Generation Tutorial for GMSH aeroslacker OpenFOAM Meshing & Mesh Conversion 12 January 19, 2012 03:52


All times are GMT -4. The time now is 15:34.