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

2d dynamic mesh negative volume

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 17, 2012, 17:44
Default 2d dynamic mesh negative volume
  #1
New Member
 
tl
Join Date: May 2012
Posts: 12
Rep Power: 14
tdbbz is on a distinguished road
Hi all,

I am working on 2d piston motion. I created three separate geometries(piston bowl, wall(stoke) and squish) in ug and then put them together as an assembly. However, when everything is all set, I got negative volumes anyway at 359.5 degree, starting from 180 degree when performing dynamic mesh. One possible reason, in my opinion, is that "wall bottom" is completely overlapped with "wall top" at TDC. I set the length of the rectangular right as equal to that of actual stroke. Do I need to increase the length of rectangular a little bit longer than the actual stroke?

any help would be highly appreciated!

Tian
Attached Images
File Type: jpg piston_motion.jpg (92.9 KB, 15 views)
File Type: jpg piston_motion1.jpg (66.8 KB, 12 views)
tdbbz is offline   Reply With Quote

Old   June 18, 2012, 05:31
Default
  #2
New Member
 
ethen
Join Date: Jun 2012
Posts: 12
Rep Power: 14
skikay is on a distinguished road
use icem method to remesh your target
skikay is offline   Reply With Quote

Reply


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
[blockMesh] error message with modeling a cube with a hold at the center hsingtzu OpenFOAM Meshing & Mesh Conversion 2 March 14, 2012 10:56
remeshing due to negative volume error Doginal CFX 1 August 21, 2011 22:50
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 22:11
Dynamic mesh, negative volume, help! vboris FLUENT 0 February 23, 2011 18:19
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14


All times are GMT -4. The time now is 00:06.