CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Lobe Pump Analysis

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

LinkBack Thread Tools Display Modes
Old   March 18, 2015, 13:45
Default Lobe Pump Analysis
New Member
Join Date: Mar 2015
Posts: 3
Rep Power: 2
asdR is on a distinguished road
I am facing error in Mesh Motion in Fluent,

Warning : non-positive volumes exist.

Error: Update-Dynamic Mesh failed. Negative cell volume detected.
Error Object : #f

Another Problem is for what we locate POINT ON PLANE and PLANE NORMAL?
Attached Images
File Type: jpg Mesh.jpg (41.4 KB, 16 views)
asdR is offline   Reply With Quote

Old   March 19, 2015, 09:35
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 545
Rep Power: 13
vasava will become famous soon enough
To avoid the 'Negative Cell Volume' you can use a smaller time-step. Time-step small enough so that the distance covered is smaller than the size of the smallest element. You can also play around the dynamic mesh parameters to have a better mesh after each time step.

If you have selected the side faces as symmetry, you can just leave them for now.
vasava is offline   Reply With Quote

Old   March 20, 2015, 02:32
New Member
Join Date: Mar 2015
Posts: 3
Rep Power: 2
asdR is on a distinguished road
Sir the side faces are defined as DEFORMING MESH ZONES as PLANE.

I took time step size as 5e-4 and number of time steps as 1000.
asdR is offline   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
CFD analysis on regenerative pump using ANSYS CFXs Rakeshvb CFX 1 July 14, 2014 18:12
Pump Cavitation Analysis in ANSYS CFX techCAE CFX 6 July 3, 2013 06:37
3d centrifugal pump analysis in fluent_turbo manuvel FLUENT 0 May 4, 2012 02:54
Lobe pump + Turbo in Gambit Hari Kamaraju FLUENT 1 December 13, 2007 04:34
Flow analysis of regenerative PUMP venky FLUENT 0 March 20, 2006 23:05

All times are GMT -4. The time now is 19:59.