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

negative efficiency of centrifugal pump

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 24, 2013, 09:09
Angry negative efficiency of centrifugal pump
  #1
New Member
 
Rohit Adhav IIT Madras
Join Date: Aug 2013
Posts: 10
Rep Power: 3
AdhavRohit is on a distinguished road
please help someone.


my simulation is converging without showing any reverse flow. but the result is

negative efficiency
negative head generated

flow rate is ok.
Attached Images
File Type: jpg pro5.jpg (96.3 KB, 19 views)
File Type: jpg neg.jpg (49.8 KB, 6 views)
AdhavRohit is offline   Reply With Quote

Old   December 26, 2013, 00:22
Default Please help somebody..i am still sttuck.
  #2
New Member
 
Bitte56
Join Date: Mar 2013
Location: India
Posts: 15
Rep Power: 4
ARohit is on a distinguished road
please help somebody..

I tried every possibility..
changing mesh,
boundary condition
time step factor ... and what not...


thanks from heart.. !!
ARohit is offline   Reply With Quote

Old   December 26, 2013, 05:18
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,805
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Are you sure you have the rotation and torque vectors defined correctly? And the flow set up correctly? Have you manually calculated the rotor torque and rotation to check it makes sense?
ghorrocks is offline   Reply With Quote

Reply

Tags
ansys cfx13, convergence problem

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
centrifugal Pump Efficiency A.farid Main CFD Forum 0 March 31, 2012 07:39
error message with modeling a cube with a hold at the center hsingtzu OpenFOAM Native Meshers: blockMesh 2 March 14, 2012 10:56
mesh airfoil NACA0012 anand_30 OpenFOAM Meshing & Mesh Conversion 12 December 12, 2011 05:16
BlockMesh FOAM warning gaottino OpenFOAM Native Meshers: blockMesh 7 July 19, 2010 14:11
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00


All times are GMT -4. The time now is 23:40.