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

dynamic mesh udf

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2014, 09:18
Unhappy dynamic mesh udf
  #1
New Member
 
hilla tor
Join Date: Nov 2012
Posts: 22
Rep Power: 13
hillat is on a distinguished road
hello I am trying to bulid a dynamic mesh in which the wall is moving like:

0.01sin(12x-20time)

when I am running the case it's written to me

Update dynamic mesh failed. negative cell volume detected

I chose smoothing method for the wall and User defined

what the problem can be?
hillat is offline   Reply With Quote

Old   February 21, 2014, 04:47
Default
  #2
Senior Member
 
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
Rep Power: 22
vasava will become famous soon enough
Can you post pictures of your case? Also are there other walls in contact wit the wall in motion?
vasava is offline   Reply With Quote

Old   February 22, 2014, 02:40
Default i uplode the case file
  #3
New Member
 
hilla tor
Join Date: Nov 2012
Posts: 22
Rep Power: 13
hillat is on a distinguished road
to here

https://drive.google.com/file/d/0B2-...it?usp=sharing

hillat4 is what i am trying to put as dynamicmesh on wall 5
hillat is offline   Reply With Quote

Old   March 1, 2014, 17:53
Default
  #4
New Member
 
Marc Pelegri
Join Date: Mar 2014
Posts: 5
Rep Power: 12
pumpkin is on a distinguished road
I have done some simulations with moving walls. One very important thing to avoid negative cell volumes is that you make sure that every time step the wall (and the mesh associated with it) does not move a distance bigger than a single cell.

Try setting a time step small enough and you won't have negative cell volumes.
pumpkin 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dynamic mesh udf for oscillating wall QBeast Fluent UDF and Scheme Programming 3 December 17, 2020 03:03
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 07:20
Dynamic mesh UDF problem Peter FLUENT 2 November 12, 2007 03:10
writing a dynamic mesh udf ALPER ALBAYRAQ FLUENT 0 October 24, 2005 09:41
Problem related with UDF for dynamic mesh Ryan FLUENT 6 April 29, 2004 10:29


All times are GMT -4. The time now is 07:13.