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

refine mesh inside a block, water surface not smooth anymore

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 20, 2013, 17:13
Default refine mesh inside a block, water surface not smooth anymore
  #1
Member
 
Join Date: Nov 2012
Posts: 65
Rep Power: 4
JohnAB is on a distinguished road
Hello,

I want to model the water surface in a towing tank system and I have the following issue:

When, in the middle of my simulation, I pause to add a block and refine the mesh within that block, the water surface then appears "broken" and definitely not smooth anymore.
When I resume simulation, this does not help and the surface never gets smooth anymore (inside this new block), even if I wait until my simulation is done, or even when I put like hundreds of iterations per time step. I still could not find a way to get everything smooth again after refining the mesh.

Does anyone have an idea about that ?

Thanks a lot!
JohnAB is offline   Reply With Quote

Old   September 25, 2013, 05:27
Default
  #2
Senior Member
 
KHB
Join Date: Aug 2010
Location: Singapore
Posts: 107
Rep Power: 6
lava12005 is on a distinguished road
The 'broken' surface might be due to the method that CCM use in interpolating the value of the old mesh to the new mesh. I suspect the software take the face value of the old mesh, that is why it might be possible that the refined mesh looks 'broken' (correct me If I am wrong).

But I think this should not be an issue. Before you refined the surface, does the surface looks fine? Run more time step?
lava12005 is offline   Reply With Quote

Old   October 4, 2013, 13:53
Default
  #3
Member
 
Join Date: Nov 2012
Posts: 65
Rep Power: 4
JohnAB is on a distinguished road
lava,

Yes, before I refine the mesh, the surface is perfectly smooth (my mesh already is very fine, just not enough for what I want to catch). I then refine within the block and it immediatly turns out to be broken within that block (where I would have guessed that it would at least look as fine as it was before).
After that, I can run as many time steps I want, the smooth surface is never coming back within that block (outside of it, it is still perfectly fine).

The only solution I have found so far to refine my water surface is to refine the mesh and completely restart the simulation from the beginning...
JohnAB 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
AMI-interface "cuts" water jet jrrygg OpenFOAM Native Meshers: snappyHexMesh and Others 0 February 15, 2013 08:08
[ICEM] Surface mesh not sticking to surface holtwong ANSYS Meshing & Geometry 0 April 4, 2012 06:14
2D Mesh Generation Tutorial for GMSH aeroslacker Open Source Meshers: Gmsh, Netgen, CGNS, ... 12 January 19, 2012 04:52
non-smooth mesh Svensson OpenFOAM Native Meshers: snappyHexMesh and Others 11 January 18, 2012 10:13
Icem Mesh to Foam jphandrigan OpenFOAM Mesh Utilities 4 March 9, 2010 03:58


All times are GMT -4. The time now is 06:51.