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

Mesh smoothing at runtime in OF

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 18, 2010, 03:21
Default Mesh smoothing at runtime in OF
  #1
Member
 
Wolfgang W.
Join Date: Nov 2009
Location: Switzerland
Posts: 57
Rep Power: 7
WiWo is on a distinguished road
Hello Foamers,

I have a question concerning dynamic meshes.

I have an oscillating circular wall (representing a bubble) inside a pipe. As the pipe and the bubble are of similar dimension and the bubble changes greatly in diameter, I employ the layerAdditionRemoval engine of TopoChangerFvMesh.

The bubble is surrounded by several concentric prism layers, which it 'eats up' when expanding and reallocates when contracting - everything fine so far.
Now this bubble won't stay perfectly spherical but rather become elliptical as it expands - and here comes the problem. Is it possible in Openfoam (using OF-1.5-dev) to 'adapt', 'relax' or 'smooth' the mesh at runtime in order to make my prism layers adapt to the form of the bubble?

So far, my bubble wall expands in an elliptical way but the prism layers - of course - stay circular, thus leading after some layerRemoval steps to a very bad mesh (see pics).

Does anybody have a suggestion on how to tackle this problem? I already tried combining with automaticMeshMotion but I can't find a way to smooth the mesh.

I would greatly welcome and appreciate any advice!
Best regards,
Wolfgang
Attached Images
File Type: jpg Bubble_topoChanger_01.jpg (83.7 KB, 84 views)
File Type: jpg Bubble_topoChanger_03.jpg (69.7 KB, 80 views)
File Type: jpg Bubble_topoChanger_04.jpg (81.9 KB, 87 views)
WiWo is offline   Reply With Quote

Old   December 2, 2011, 15:25
Default
  #2
Senior Member
 
lakeat's Avatar
 
Daniel WEI (老魏)
Join Date: Mar 2009
Location: South Bend, IN, USA
Posts: 688
Blog Entries: 9
Rep Power: 12
lakeat is on a distinguished road
Send a message via Skype™ to lakeat
Quote:
Originally Posted by WiWo View Post
Hello Foamers,

I have a question concerning dynamic meshes.

I have an oscillating circular wall (representing a bubble) inside a pipe. As the pipe and the bubble are of similar dimension and the bubble changes greatly in diameter, I employ the layerAdditionRemoval engine of TopoChangerFvMesh.

The bubble is surrounded by several concentric prism layers, which it 'eats up' when expanding and reallocates when contracting - everything fine so far.
Now this bubble won't stay perfectly spherical but rather become elliptical as it expands - and here comes the problem. Is it possible in Openfoam (using OF-1.5-dev) to 'adapt', 'relax' or 'smooth' the mesh at runtime in order to make my prism layers adapt to the form of the bubble?

So far, my bubble wall expands in an elliptical way but the prism layers - of course - stay circular, thus leading after some layerRemoval steps to a very bad mesh (see pics).

Does anybody have a suggestion on how to tackle this problem? I already tried combining with automaticMeshMotion but I can't find a way to smooth the mesh.

I would greatly welcome and appreciate any advice!
Best regards,
Wolfgang
I made surface point moving and then laplacian smooth the whole flow point. If the initial mesh is not too bad, then the results are acceptable.
__________________
~
Daniel WEI
-------------
NatHaz Modeling Laboratory
Department of Civil & Environmental Engineering & Earth Sciences
University of Notre Dame, USA
Email || My Personal CFD Blog
lakeat 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
SnappyHexMesh for internal Flow vishwa OpenFOAM Native Meshers: snappyHexMesh and Others 23 August 6, 2014 03:50
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
vtk mesh or Abaqus mesh to OpenFOAM bigphil Open Source Meshers: Gmsh, Netgen, CGNS, ... 19 August 16, 2011 04:14
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10
Mesh smoothing schemes Tony Main CFD Forum 10 December 7, 2001 01:55


All times are GMT -4. The time now is 23:51.