CFD Online Logo CFD Online URL
Home > Forums > FLUENT


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

LinkBack Thread Tools Display Modes
Old   December 29, 2006, 08:14
ammi reddy
Posts: n/a
Hi i am modeling reciprocating compressor by dynamic meshing (cylinder piston arrangement).

lenght of compressor is=0.0075m radius=r=0.00954m

my udf function for piston is

frequency = f=34hz w=2*Pi*f=213.62rad/s displacement of piston is X= 4.511e-3m piston head velocity =V= 0.9631Cos(w t) i am taking time step=dt= 7.3529e-4s no of time steps = 40 I am getting negative volume problem as follow

Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: ()

How to solve this problem.Waiting for your kind suggestions? ammi reddy

  Reply With Quote

Old   January 3, 2007, 08:10
Posts: n/a
Hi Ammi, check your cell sizes in respect to the moving wall velocity. usually you get the statement as soon as the moving cellwall and the stationary wall overlap. kais
  Reply With Quote


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
how to set periodic boundary conditions Ganesh FLUENT 13 January 22, 2014 05:11
BlockMesh FOAM warning gaottino OpenFOAM Native Meshers: blockMesh 7 July 19, 2010 14:11
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00

All times are GMT -4. The time now is 14:40.