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

Lobe pump

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

Like Tree1Likes
  • 1 Post By Jan Smedseng

Reply
 
LinkBack Thread Tools Display Modes
Old   March 18, 2015, 07:35
Default Lobe pump
  #1
New Member
 
Chetan
Join Date: Mar 2015
Posts: 7
Rep Power: 3
drcsm is on a distinguished road
Dear all,

I am trying to solve a problem of lobe pump. for devlopement i used immersed solid method for both the lobes.

i am facing problem in.

1. In giving rotation to both the lobes as their rotation axis is not global axis.
2. If use two point method than how to locate those two points?
3. I have selected mass flow inlet and static pressure outlet with symmetry as boundary condition.
4. While solving problem my solver ges excited with " non zero exit error-2".

Guide me how to proceed with or without immerged body problem.

thanks.
drcsm is offline   Reply With Quote

Old   March 18, 2015, 18:22
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Have you done the CFX tutorial examples? There is an example of exactly this sort of simulation.

Have a think about whether a mass flow inlet is appropriate. I would have thought a pressure inlet (or opening) would be more appropriate, as the flow is likely to be a bit pulsating.
ghorrocks is offline   Reply With Quote

Old   March 19, 2015, 05:17
Default
  #3
New Member
 
Chetan
Join Date: Mar 2015
Posts: 7
Rep Power: 3
drcsm is on a distinguished road
Dear sir,

I think yiu are right but i am facing problem at the innitial stage only in terms of defining rotation axis for both the lobes... can you please guide how to locate he rotation axis which is other than global axis?
drcsm is offline   Reply With Quote

Old   March 31, 2015, 03:40
Default hi
  #4
New Member
 
allan
Join Date: Mar 2015
Posts: 3
Rep Power: 3
xiashang8898 is on a distinguished road
Dear sir,

I think wo do the same thing, my job is about a helical gear pump, if you join the QQ group (i built it for this reason) 337969380 , i think we will have a good discussion, or you can send me email 619313616@qq.com ,i hope we'll have a good talk!
xiashang8898 is offline   Reply With Quote

Old   April 23, 2015, 09:19
Wink Maybe twinmesh can help you
  #5
Member
 
Jan
Join Date: Jul 2013
Location: Berlin - Germany
Posts: 35
Rep Power: 5
Jan Smedseng is on a distinguished road
Hallo.

If you want to calculate lobe pumps with ANSYS CFX or ANSYS Fluent, I want to recommend the program Twinmesh, developed by CFX Berlin.
www.twinmesh.com

This program allowes you to generate the grids for each timestep and provides the complette setup of your simulation for ANSYS CFX.
The way using different grids will provide much better results as using immersed solids. As the meshes have the same topology, no interpolation between the timesteps is needed.
There are also tutorials for the usage of twinmesh and the calculation of lobe pumps in ANSYS CFX included.

Regards,
Jan Smedseng
unclewallcn likes this.
Jan Smedseng is offline   Reply With Quote

Old   April 23, 2015, 21:39
Default hi
  #6
New Member
 
allan
Join Date: Mar 2015
Posts: 3
Rep Power: 3
xiashang8898 is on a distinguished road
Quote:
Originally Posted by Jan Smedseng View Post
Hallo.

If you want to calculate lobe pumps with ANSYS CFX or ANSYS Fluent, I want to recommend the program Twinmesh, developed by CFX Berlin.
www.twinmesh.com

This program allowes you to generate the grids for each timestep and provides the complette setup of your simulation for ANSYS CFX.
The way using different grids will provide much better results as using immersed solids. As the meshes have the same topology, no interpolation between the timesteps is needed.
There are also tutorials for the usage of twinmesh and the calculation of lobe pumps in ANSYS CFX included.

Regards,
Jan Smedseng
thank your recommendation,i wanted to have a try once ,but i do not have the program,and i am a student ,can not afford such a expensive software,even no matter how i want.
xiashang8898 is offline   Reply With Quote

Old   April 23, 2015, 21:50
Default
  #7
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,832
Rep Power: 100
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Then the immersed solids approach is likely to be your best path forward. It has limitations which you should be aware of, but is by far the easiest way of modelling these sort of pumps.
ghorrocks is offline   Reply With Quote

Reply

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 Chalghoum CFX 18 April 16, 2014 06:37
Assistance in Vacuum pump simulation enr_venkat CFX 5 November 20, 2012 12:50
Regenerative pump modelled in FLOEFD pro YYY FloEFD, FloWorks & FloTHERM 2 October 5, 2009 05:04
Lobe pump + Turbo in Gambit Hari Kamaraju FLUENT 1 December 13, 2007 04:34
Discharge pump flow Ali Main CFD Forum 0 March 5, 2003 18:11


All times are GMT -4. The time now is 15:56.