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

CFX: Transient sim with fluid-fluid domain interface

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 3, 2010, 12:44
Default CFX: Transient sim with fluid-fluid domain interface
  #1
New Member
 
Fidel Arzola
Join Date: Mar 2010
Location: Venezuela
Posts: 5
Rep Power: 16
farzola is on a distinguished road
Hello all,
I'm simulating a Kaplan hydraulic turbine. I got a good convergence in steady state, but I'm studying unsteady flows and of course is needed to carry out transient simulations.

I'm using a fifth part of runner subdomain and a complete draft tube geometry (the water conduit to the exit), this is equivalent to said a pitch angle for side one equal to 72 degrees and a pitch angle for side two equal to 360 degrees. Then I can see a very good behavior of oscillations due to blade passage frequency in the outlet of the runner but it didn't pass to the draft tube subdomain . So, what's happens? From the draft tube point of view it's as the fifth part of runner is a total water passage way.

Someone can give me a recommendation to try to solve it.
__________________
Thanks,
Fidel
farzola is offline   Reply With Quote

Old   April 4, 2010, 08:34
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Sorry, I don't understand your question.
ghorrocks is offline   Reply With Quote

Old   April 6, 2010, 13:05
Default
  #3
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
Fidel,
Did you remember to check the pitch change on the rotor-draft tube interface? That seems to be the problem.
brunoc is offline   Reply With Quote

Old   April 6, 2010, 13:07
Default
  #4
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
Fidel,
From what you said you have two domain interfaces. Did you check the pitch change on both of them?
brunoc is offline   Reply With Quote

Old   April 7, 2010, 16:08
Default
  #5
New Member
 
Fidel Arzola
Join Date: Mar 2010
Location: Venezuela
Posts: 5
Rep Power: 16
farzola is on a distinguished road
Quote:
Originally Posted by brunoc View Post
Fidel,
Did you remember to check the pitch change on the rotor-draft tube interface? That seems to be the problem.
I'm setted a pitch change between rotor and draft tube equal to 72°/360° and a pitch change between distributor and rotor equal to 15°/72°. Is that correct?
__________________
Thanks,
Fidel
farzola is offline   Reply With Quote

Reply

Tags
interface domains, pitch angle, transient simulation, turbine blade


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
Can CFX do CHT simulations with a solid domain rotating in a stationary fluid domain? acro CFX 15 September 23, 2016 12:16
Pressure fluctuations along transient rotor-stator interface Norbert CFX 4 March 31, 2010 08:54
RPM in Wind Turbine Pankaj CFX 9 November 23, 2009 05:05
domain interface on CFX 11 Rogerio Fernandes Brito CFX 1 June 22, 2008 19:41
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11


All times are GMT -4. The time now is 03:42.